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【多选题】
以下对溴化乙锭定量法的描述正确的有（ ）
A.
可以精确定量DNA
B.
溴化乙锭可参入DNA碱基平面，可被紫外光激发出荧光
C.
荧光强度与溴化乙锭参入量成正比
D.
参入溴化乙锭的量与DNA分子长度成正比
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】下列关于综合布线的描述中，错误的是
A.
终端有高速率要求时，水平子系统可采用光纤直接铺设到桌面
B.
多介质信息插座是用于连接双绞线
C.
干线线缆铺设经常采用点对点结合和分支结合两种方式
D.
采用在管理子系统中更改、增加、交换、扩展线缆的方式来改变线缆路由
【单选题】下列关于课堂气氛的描述,错误的一项是:
A.
要想有良好的课堂气氛，首先要有良好的校风
B.
营造良好的课堂气氛，教师要发挥主导作用
C.
. 课堂气氛与教师的领导方式有关
D.
课堂气氛与教师对学生的期望有关
【单选题】下列关于正常成人心电图各波段的描述，错误的是
A.
P-R间期为0.12～0.2s
B.
P波时限＜0.11s
C.
Q-T间期为0.36～0.44s
D.
QRS波群时限为0.06～0.1s
E.
肢体导联S-T段上抬＜0.1mV
【单选题】Part ADirections: Read the following four texts．Answer the questions below each text by choosing A, B, C or D．(40 points)The long year of food shortage in this country have suddenly given way to appar...
A.
The abundant food supply is not expected to last
B.
Britain is importing less food
C.
Despite the abundance, food prices keep rising
D.
Britain will cut back on its production of food
【单选题】The long year of food shortage in this country have suddenly given way to apparent abundance. Stores and shops are choked with food. Rationing (定量供应 ) is virtually suspended, and overseas suppliers ha...
A.
the fall in world food prices would benefit British food producers
B.
an expansion of food production was at hand
C.
British food producers would receive more government financial support
D.
it looks depressing despite government guarantees