大接地短路电流系统的接地电阻值R应满足（）
A.R≤10Ω
B.R≤5Ω
C.R≤1Ω
D.R≤0.5Ω
参考答案：D
------How do you usually deal with the problems?
------I usually do that _______ thinking hard or asking the teacher for help.
A．with
B．by
C．in
D．for
牛虎铜案
