He realized his mistakes and took action

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问题选择题

He realized his mistakes and took action to reduce the loss _________ it was too late.

A．until

B．when

C．before

D．as

答案

答案：C

题目分析：句意：他意识到自己的错误并且采取措施来尽可能地减少损失。before意为“在……之前”，即在太晚之前采取措施；故选C。

单项选择题

在稳定的线形系统中加一个频率为W的正弦线号输出（）。

A.仍为同频率的正弦信号

B.不同频率的正弦信号

C.非正弦信号

D.不一定

单项选择题

设有定义：10ng x=-123456L，则以下能够正确输出变量x值的语句是( )。

A．printf("x=%d\n",x);

B．printf("x=%1d\n",x);

C．peintf("x=%8dL\n",x);

D．printf('x=%LD\n",x);