根据GB7588-2003相关规定,对于用3根或3根以上悬挂钢丝绳的曳引驱动电梯,钢丝绳的安全系数应不小于()。
A、10
B、12
C、6
D、20
参考答案:B
—It’s our duty to homeless people in earthquake areas food and clothes.
—I agree with you. We should do something for them.
A. provide, of B. provide , with C. provide , for
被减数、减数与差的和是320,被减数是______,如果差是60,那么减数是______.