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【单选题】
单向晶闸管是一种可控制的单向导电开关,常用于( )的各类电路中。A.
控制弱电
B.
弱电控制
C.
对弱信号进行放大
D.
对强信号进行放大
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反馈参考答案：
举一反三
【单选题】What does the phrase "two ways" refer to in the 6th paragraph?
A.
Calling on customers and communication in writing.
B.
Orally and verbally.
C.
By face-to-face contact and by correspondence.
D.
By trade delegations and groups.
【多选题】What are the two main ways of handling the traffic?
A.
Building new ways
B.
Reducing the number of cars
C.
Using technology
D.
Raising the oil price
【简答题】试用力法求解如图12-25a所示超静定梁，并作出其弯矩图，已知梁的抗弯刚度为EI。
【简答题】试用力法求解如图12-24a所示超静定梁，并作出其弯矩图，已知梁的抗弯刚度为EI。
【单选题】According to the passage, how many ways are there for water to get into the air?
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【单选题】(练习1-4) What does the phrases “two ways” refers to in the 6th paragraph?
A.
calling on customer and communication in writing
B.
orally and verbally
C.
by face-to-face contact and by correspondence
D.
by trade delegations and groups
【单选题】What are two ways that we can organize paragraphs according to thispresentation?
A.
introduction, body, and conclusion
B.
block style. and point-by-point style
C.
summative and narrative
D.
point-by-point style. and comparative style
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