类圆柱体（）
蜡样管型（）

A . 多为长线形，粗细不等，边缘不清，常显暗淡的长丝纹，末端多为尖头状
B . 无色半透明圆柱体，大小、长短不一，两边平行，两端钝圆，平直或略带弯曲，有时可见少量颗粒或个别细胞
C . 形态似透明管型，但末端有一条尖细的尾巴，呈螺旋形或盘旋在圆柱上
D . 形似透明管型，但色灰暗，边缘有切迹，末端常不整齐，呈折断状或扭转状
E . 由黏液性纤维物、黏液非晶体形尿酸盐、磷酸盐等形成的圆柱体

使用钢笔工具和通道结合使用

使用魔棒工具和通道结合使用

使用快速选择工具和魔棒工具结合使用

使用钢笔工具和魔棒工具结合使用

正确

错误

正确

错误

1

2

3

4

适当暗的背景

从被摄体的后方高光位照明

正面或侧面补光

底光补光

曝光略多1/3

曝光略少1/3

前区亮于后区

后区亮于前区

亮度相同

多为单纯疱疹病毒感染

人乳头瘤病毒感染

维生素B缺乏

风疹病毒

多为血管神经性水肿

角膜云翳

角膜斑翳

黏连性白斑

角膜水肿

正确

错误

As you can imagine, organic agricultural practices are quite distinct from those of "conventional" fanning.

Organic farmers:

feed soil and build soil matter with natural fertilizer to grow their crops use insect predators, mating disruption, traps and barriers to protect crops from pests and disease make use of crop rotation, mechanical tillage and hand-weeding, as well as cover crops, mulches, flame weeding and other management methods to control weed growth.As a last resort, organic farmers may apply certain botanical or other non-synthetic pesticides. Conventional farmers:,

apply chemical fertilizers to the soil to grow their crops spray with insecticides to protect crops from pests and disease use synthetic herbicides to control weed growth.

Look for the word "organic" on vegetables or pieces of fruit, or on the sign above the organic produce display. The word "organic" may also appear on packages of meat, cartons of milk or eggs, cheese and other single-ingredient foods. Foods labeled "100 percent organic" must contain only organic ingredients. Products containing at least 70 percent organic content can be labeled "made with organic ingredients". Those foods labeled simply "organic" must have at least 95 percent organic ingredients, by weight or fluid volume, excluding water and salt. Anyone who knowingly sells or labels a product "organic" that is not produced and handled in accordance with these regulations can face a civil penalty of up to $10,000.

Foods grown and processed according to the federal standards will in most cases bear the seal "USDA Organic". As its use is voluntary, companies may choose not to display the seal.

Why Should I Care if a Food is Organic According to the USDA, organic food production allows farmers to lower input costs, decrease reliance on nonrenewable resources, capture high-value markets and premium prices, and boost farm income. Organic agriculture also has many important environmental, benefits:

It promotes sustainability by establishing an ecological balance to pr soil fertility or pest problems. In the long run, organic farms tend to conserve energy and protect the environment by maintaining ecological harmony.

It enhances biodiversity, or the presence of multiple plant and animal species. Having a highly diverse genetic pool becomes useful in the future when beneficial characteristics can be tapped.

Because organic agriculture utilizes practices such as crop rotations, inter-cropping, symbiotic associations, cover crops and minimum tillage, the length of time that the soil is exposed to erosive forces is decreased, which minimizes nutrient losses and boosts soil productivity. By not using synthetic fertilizers and pesticides, organic agriculture-reduces pollution of groundwater.

Organic agriculture helps to minimize the greenhouse effect and global warming through its ability to keep carbon in the soil.

Prices tend to be higher for organic titan conventional products. As stated on the Web site of the Food and Agriculture Organization (FAO) of the United Nations (UN), certified organic products are generally, more expensive than their conventional counterparts because:

The organic food supply is limited as compared to demand. Production costs for organic foods are typically higher because of greater labor input and because farmers don’t produce enough of a single product to lower the overall cost.

Post-harvest handling of relatively small quantities of organic foods results in higher costs because organic and conventional 0roduce must be separated for processing and transportation.

Marketing and the distribution chain for organic products are relatively inefficient, and costs are higher because of relatively small volumes.

The FAO also notes that as the demand for organic food and products increases, technological innovations and economies of scale should reduce costs of production, processing, distribution and marketing for organic produce.

Organic and conventional food must meet the same quality and safety standards. Organic food differs from conventionally produced food simply in the way it is grown, handled, and processed. There is no scientific evidence to suggest that it is more nutritious or safer than conventional food. A recently published report indicates that organic food is less likely to contain pesticide residues than conventional food. Yet, according to the National Research Council, the traces of pesticides left on conventionally grown products are unlikely to cause an increased cancer risk. Also, if fruits and vegetables are properly washed, most of the chemicals can be removed. As for taste, that’s up to you to decide what you like best. In general, people tend to find that the fresher a food is, the better it tastes, regardless of how it was produced.

低熔合金铸造包埋材料

中熔合金铸造包埋材料

高熔合金铸造包埋材料

铸钛包埋材料 E．以上均不是

0-1％～0.2％

0.6％

0.8％～1.0％

1.6％

2％

正确

错误

苏合香

乳香

没药

阿魏

安息香

色泽较黄

色泽较透

色泽较暗

色泽较白