贴塑导轨(在两个金属滑动面之间粘贴了一层特制的复合工程塑料带)比滚动导轨的抗振性要好,主要是由于动、静副之间的()。
A.面接触
B.线解触
C.点接触
D.无接触
参考答案:A
Statistics show that men have _____ as women do for every mile they drive. [ ]
A. serious accidents as twice many
B. twice as many serious accidents
C. twice serious accidents as many
D. serious accidents as many twice
2005年版第五套人民币5元券纸币的固定花卉水印,在右侧图片中()号位。
A、(4)
B、(6)
C、(12)
D、(15)