绝缘材料的耐湿性可用透湿性和()两个指标来衡量。
参考答案:吸水性
My mother is a kind woman, _____________?[ ]
A. is she
B. is he
C. isn't she
D. isn't he
在OSI模型中,在物理媒介上传输比特流的层是()。
A.物理层
B.数据链路层
C.网络层
D.传输层