以下叙述中正确的是( )。

以下叙述中正确的是( )。A.调用printf函数时,必须要有输出项 A.调用printf函数时,必须要有输出项 B.使用putchar函数时,必须在之前包含头

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She stood there,trembling with fear.

She stood there,trembling with fear.A.jumping B.crying C.moving D.shaking

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You have to be patient if you want to sustain your position

You have to be patient if you want to sustain your positionA.maintain B.better C

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The girl is gazing at herself in the mirror.

The girl is gazing at herself in the mirror.A.smiling B.laughing C.shouting D.st

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下列叙述中正确的是( )。

下列叙述中正确的是( )。A.软件交付使用后还需要进行维护 B.软件一旦交付使用就不需要再进行维护 C.软件交付使用后其生命周期就结束 D.软件维护是指修复程序

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