预防生产静电危害措施有（）。
A、穿化纤衣服
B、使用塑料制品装存
C、没有接电导电橡胶板
参考答案：C
常用法兰密封面的形式有平面型、凹凸型、槽型三种。
How can the satellites catch the information about the soil
A．By turning the intensity of sunshine into maps.
B．By analyzing the recent weather report.
C．By capturing the microwave radiation from the soil.
D．By analyzing information provided by ground observation centers.
