Word软件绘图工具栏中,椭圆按钮的作用是在活动文档中插入椭圆。如果要绘制椭圆,则在拖动的同时按住()键。
A、“Shift”
B、“Alt”
C、“F2”
D、“F4”
参考答案:A
现场施工电源设施,除经常性维护外,每年( )前应检修一次,并测量( )。
A.雨季,绝缘电阻 B.夏季,电流C.冬季,电压 D.汛期,绝缘电阻
His grandfather ________ for seven years.
A.died
B.had died
C.has died
D.has been dead