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【单选题】
腹足类田螺科的螺类的有性生殖（）。A.
卵生
B.
胎生
C.
卵胎生
D.
孤雌生殖
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反馈参考答案：
举一反三
【简答题】A．taking B．bringing C．getting D．introducing
【单选题】某三极管的极限参数为:Icm=100mA,V(BR)CEO=20V, PCM=100mW则该元件安全工作状态为( ) A. Ic=10mA Vce=15V B. Ic=10mA Vce=9V C. Ic=20mA Vce=9V
A.
Ic=10mA Vce=15V
B.
Ic=10mA Vce=9V
C.
Ic=20mA Vce=9V
【简答题】While introducing, ____________ to make them feel important.
【单选题】Don’t worry if you can’t understand everything. The teacher will ______ the main points at the end.
A.
recover
B.
review
C.
require
D.
remember
【单选题】I can't understand ______ at that poor child.
A.
you to laugh
B.
you laugh
C.
why laugh
D.
your laughing
【多选题】Which sentences are introducing the business scale?
A.
We are introducing ourselves as one of the the leading companies in China in automobile manufacturing.
B.
We are introducing ourselves as a corporation dealing with elevators.
C.
Our products are mainly electrical automobiles.
D.
Our products are of high quality.
【简答题】某三极管的极限参数ICM =100mA,PCM =150mW,U(BR)CEO =30V,若它的工作电压UCE =10V,则工作电流IC不得超过( )mA,若工作电流IC =1 mA,则工作电压的极限值应为( )V。
【单选题】Which of the following best describes the development of the passage?
A.
Introducing the issue→describing the actual status→citing ways to deal with the issue →offering reasons.
B.
Describing the actual status→introducing the issue→citing ways to deal with the issue →offering reasons.
C.
Introducing the issue→citing ways to deal with the issue→describing the actual status→offering reasons.
D.
Describing the actual status→offering reasons→introducing the issue→citing ways to deal with the issue.
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