题目内容：
在IT系统中，一般保护接地电阻值不超过（）Ω即可将设备故障时对地电压限制在安全范围以内。A．4
B．10
C．20
D．30
参考答案：
单选：在IT系统中，一般保护接地电阻值不超过（）Ω即可将设备故障时对地电压限制在安全范围以内。A．4B．10C．20D．30
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A．4
B．10
C．20
D．30
A．4
B．10
C．20
D．30
—This maths problem is easy ______.A. work out B. to be working out C. worked D.
—This maths problem is easy ______.A. work out B. to be working out C. worked D.
1kV及以下电力电绳和控制电缆、可用IkV兆欧缘、绝缘电阻值一般不低于（）MΩ。A．10B．20C．40D．100
1kV及以下电力电绳和控制电缆、可用IkV兆欧缘、绝缘电阻值一般不低于（）MΩ。A．10B．20C．40D．100
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—Would you like something______?A. drink B. to drink C. drinking D. for drinking
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