--- Has Li Lei finished his work today?

搜题请搜索小程序“爱下问搜题”

问题选择题

--- I have no idea, but he ______ it when I saw him this morning.

A．had done

B．would do

C．was doing

D．did

答案

答案：C

多选题

三颗人造地球卫星A、B、C绕地球作匀速圆周运动，如图所示，已知M_A=M_B＞M_C，则对于三个卫星，正确的是（　　）

A．运行线速度关系为v_A＜V_B＜V_C

B．运行周期关系为 T_A=T_B＜T_C

C．向心力大小关系为 F_A＞F_B＞F_C

D．运行半径与周期关系为

单项选择题

下列命令中，属于刷新、查找数据或定位记录命令是 ______。

A．Restore

B．Requery

C．Msgbox

D．RunApp