直流蓄电池一般按照10小时率进行放电,容量为600Ah的蓄电池组,设定放电电流应为()
A.40A
B.60A
C.80A
D.100A
参考答案:B
We were in our investigation(调查)by the cooperation of the local police. [ ]
A. stopped
B. cooperated
C. aimed
D. aided
薛弗认为最佳团体规模为()
A.2~3人
B.3~5人
C.5~7人
D.7~9人