在单向板配筋中,板底短向钢筋应放置在长向钢筋的()。
A.上部
B.下部
C.任意位置
D.交叉放置
参考答案:B
采用洁净的()清洁电磁制动器动静衔铁表面杂物。
A、棉布
B、毛刷
C、钢丝刷
D、铲刀
Regulations of Customs duties on Imports and Exports of the People's Republic of China is one of the ______ basis of the collection of the Customs duty.
A. legal B. finacialC. managerial D. none of the above