移动通信基站地网的接地电阻值应小于()欧姆。
参考答案:5
世界最大的湖泊是[ ]
A.青海湖
B.贝加尔湖
C.死海
D.里海
It matters little a teacher looks like but matters much is how a teacher
teaches his/her students.
A.how;what
B.how;it
C.what;what
D.what;it