题目内容

受电弓可分单臂弓和双臂弓两种,一般采用双臂弓。

A. 对
B. 错

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接触网的金属导线一般布置成之字形。

A. 对
B. 错

受电弓一般采用驱动电机驱动。

A. 对
B. 错

Lambda PL promoter is used in which vectors?

A.Cloning vectors
B.Expression vectors
C. Both cloning and expression vectors
D.Bacteriophage Mu

tac promoter is an example of which type of promoter?

A.hybrid promoter
B.fusion promoter
C.lacZ promoter
D.araBAD promoter

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