题目内容

M7120型磨床的控制电路，当具备可靠的（）后，才允许启动砂轮和液压系统，以保证安全。

A. 交流电压
B. 直流电压
C. 冷却泵获电
D. 交流电流

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东风4B型内燃机车电空接触器主要由主触头及（）、辅助触头、电空驱动装置等部件组成。

Which of the following statements about variables and their scopes are true？（）

A. Instance variables are member variables of a class.
B. Instance variables are declared with the static keyword.
C. Local variables defined inside a method are created when the method is executed.
D. Local variables must be initialized before they are used.

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