用于答复下级机关请示事项的公文是（）。
A.指示
B.请示
C.批复
D.命令
参考答案：C
The president, together with his bodyguards, ____ to the nuclear station ___ there was an accident
20 minutes ago. [ ]
A. have come, which
B. came, in which
C. has come, where
D. came, in where
用来定义双字变量的伪指令是（）。
A.DB
B.DW
C.DD
D.DQ
