库存器材装备保管、保养方面的检查，基层中队（）检查一次。
A.每周
B.半月
C.每月
D.每季
参考答案：B
用适当的介词填空，如不需填则画“／” 。
1. Will you have a chemistry lesson _______ next term?
2. What do you usually do _______- weekends?
3. I have too much homework _______this weekend.
4. We are leaving ________ the 15th.
5. Christmas Day is _______ December.
启动柜有启动，没有运行如何判断故障？
