沥青路面破坏形式（）
A.低温破坏
B.高温破坏
C.水损坏
D.盐破坏
参考答案：A, B, C
My family ________ supper together every day. It’s really a happy time for all of us.
A．have
B．had
C．are having
D．will have
低压电力网中的电源系统工作接地电阻不超过()。
A.2Ω
B.3Ω
C.4Ω
D.6Ω
