—_____ do you have music?
—On Tuesday. [ ]
A. Where
B. Why
C. When
D. How
答案:C
影像增强管输入屏有效直径是20.32cm,输出屏有效直径是2.54cm,缩小增益是
A.81B.64C.49D.9E.8
经济情况好转时,新收订单______,未交货订单______。( )
A.增加,减少B.减少,增加C.减少,减少D.增加,增加