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【简答题】

Although the Ar camel, or dromedary, can go without drinking for a long while, its hump(驼峰) does not store water as is commonly believed. The real 【B1】______ of the animal’’s unusual ability to store water 【B2】______ in the fact that very 【B3】______ of the camel’’s water is lost by 【B4】______ through the skin. Instead of 【B5】______ out great quantities of water, the camel’’s body temperature 【B6】______, sometimes as much as eleven degree, to compensate 【B7】______ external heat. When a camel 【B8】______ require water, it replaces only the 【B9】______ lost since its last drink. In Egypt, 【B10】______ November and April, the camel 【B11】______ go for three or four months without drinking if it 【B12】______ in lush(繁茂的) pastures where dew(露水) and 【B13】______ keep the vegetation green. If only 【B14】 ______ feed is available, the camel will get 【B15】______ after several weeks—even during January. The 【B16】______ of time a camel can go without drinking is greatly 【B17】______ by time of year, force of wind, heat in the air, 【B18】______ of sunlight, amount of the 【B19】______ carried, speed that animal travels, and number of hours spent daily 【B20】______ travel.

A.exhausted
B.tired
C.thirsty
D.hungry

题目标签:驼峰
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参考解析:
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【单选题】驼峰的道岔区坡其坡度一般为()。

A.
5%~8%
B.
5‰~8‰
C.
1%~3.5%
D.
1‰~3.5‰

【多选题】驼峰分路道岔区段和减速器区段轨道电路,当在轨道电路入口处分路时()。

A.
轨道继电器应可靠落下
B.
轨道继电器应可靠吸起
C.
其落下时间应不大于0.2s
D.
其落下时间应不大于0.4s

【多选题】驼峰处的参数()。

A.
切削速度偏低
B.
金屑切除率也较低
C.
在生产中往往没有实用价值
D.
一般生产中常选用位于驼峰以右的切削速度