任何一把刀具一旦刃磨成形后,不管其加工方式如何,其主、副切削刃便完全确定了。
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非动转储油罐按要求多长时间测量一次?()
A. 2天
B. 3天
C. 5天
D. 7天
国务院于2007年7月11日颁布了《民用核安全设备监督管理条例》(国务院第()号令)。
A. 300
B. 400
C. 500
D. 600
Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?()
A. To allow for greater expansion due to higher operating temperature
B. To seal the cylinder against leakage of combustion gases
C. To provide an additional surface for oil cooling
D. To provide an additional strength for the crown and lower structure