题目内容

People think that electronic X-ray equipment can hold ___________at bay.

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Airports are still a place of education and fun today.

A. 对
B. 错

A—Diskette drive B—Liquid Crystal DisplayC—Left Speaker D—System-expansion connectorE—System-status indicators F—Audio control panelG—Power switch H—Modem connectorI—Line-in jack J—Headphone jackK—Memory door L—MicrophoneM—External input device connector N—Power jackO—External Monitor port P—Microphone jackQ—Audio volume control

关于for结构,以下哪个表述错误?

A. for结构中的3个表达式之间是分号
B. for结构中必须是3个表达式
C. for结构中exp2可以控制循环的次数
D. for结构中3个表达式可以缺省

假设如下语句,输出结构和循环结束后x的值是多少?for(x=9;x>5;x--)printf("%d",x);

A. 输出:9876,x为5
B. 输出:9876,x为6
C. 输出:98765,x为5
D. 以上都不对