为了安装或检查故障方便，应采用电气接线图。（）
参考答案：对
As is known to all, the United States uses energy as the whole of Europe.[ ]
A. as twice
B. twice much
C. twice as much
D. twice more
执行语句for(i=1；i++＜4；)；，后变量i的值是
A．3
B．4
C．5
D．不定
