不定项选择

方框图中的比例环节不能有两个或两个以上输出端。

A．错误
B．正确

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单项选择题

Given that i = 100 sin（314 t － 30°）A, u = 311sin（314 t + 60°）VFind the phase difference between u and i ( ).
A、– 90°
B、30°
C、– 30°
D、90°

单项选择题

Which statement related to work attitudes is incorrect?
A、U.S. attitudes toward work are more relaxed than those in Europe.
B、In the United States, hard work is applauded and often rewarded.
C、The Japanese attitude toward work is very group oriented.
D、 In the United States, the attitude toward work is ingrained from an early age.