工矿的防静电接地接地电阻值一般不大于()。
A、2Ω
B、4Ω
C、10Ω
D、100Ω
参考答案:D
— What's the weather like here?
— _____. Look! I am wearing a scarf.
A. It's sunny
B. It's cloudy
C. It's windy
D. It's rainy
生产中最常用的正确的定位方式有()定位和()定位两种。