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【单选题】
在选择操纵变量时,下列说法正确的是( )。A.
尽量选用直接指标作为操纵变量，当无法获得时，可选用与直接指标有单值对应关系的间接指标
B.
操纵变量应能被测出来，并且具有足够大的灵敏度
C.
应使控制通道的时间常数尽量的大
D.
应使控制通道的纯滞后尽量的小
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【简答题】哪种寄生虫感染宿主后,宿主既是它的中间宿主、又是它的终末宿主。先为终末宿主,后为中间宿主。A. 旋毛虫 B. 日本血吸虫 C. 弓形虫 D. 华枝睾吸虫
【简答题】超声波传感器由哪几部分构成?
【简答题】Have you know Paula _____ last summer?
【单选题】Peter Paul
A.
Overfishing results from extensive use of new technologies．
B.
Many people in my place support stricter regulation on fishing．
C.
I think that you failed to point out the real reason for overfishing．
D.
We are in a very weak position to compete with other countdes in fishing．
E.
Sooner or later，we will feel regretful about out current fishing practice．
F.
I didn’t know there were such damaging ways of fishing around the world．
G.
I wonder if those fishermen have ever considered the consequences of exhausting ocean resources．