下列哪一种是使用螺丝批时要注意的事项?
A.不应将工件置于手中
B.须将工件置于手中
C.亦可当凿使用
参考答案:A
The 18 college students in Fudan University should show their greatest respect to their hero — Zhang Ninghai instead of being cold and unfeeling.
A.absolutely
B.slightly
C.fluently
D.painfully
铁路混凝土应采用()进行集中生产。