单项选择题

图示电路开关原来闭合，且电路已达稳态。t=0是开关断开，则t>0时的电感电流等于
A、
B、
C、
D、

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单项选择题

Judicial review refers to the power of the federal courts to __________.
A、 make the final interpretation of the Constitution.
B、 declare a legislative or executive act invalid if it violates the Constitution.
C、 extend the judiciary power into the realm of the executive branch.
D、 forbid the federal government from contracting with employers who permanently replaced striking employees.

多项选择题

传统印刷的特点为（）
A. 按需
B. 大批量
C. 高质量
D. 可变