光缆在普通土、硬土条件下，埋深标准为≥（）m。
A.0.8
B.1
C.1.1
D.1.2
参考答案：D
具备启普发生器原理的简易装置是
用适当的介词填空。
1.I go to school ____ the morning.
2.Bill gets up ____ half past five every morning.
3.We don't have any lessons _____ Sunday.
4.We play football ____half _____ five in the afternoon.
5.- When is your English lesson?
- ____ seven.
