10-35kV绝缘承力工具和绝缘绳索的有效绝缘长度不得小于（）m。
A.0.4
B.0.5
C.0.6
D.1.5
参考答案：A
一定含有两种元素的物质是（ ）
A．混合物
B．氧化物
C．化合物
D．单质
Kate didn't come yesterday, or you ________ her. [ ]
A. might have seen
B. were to see
C. had seen
D. would see
