下装鹤管接头中心距地面宜为(),应在发油岛上设鹤管停靠装置和余油回收装置。
A. 600mm
B. 700mm
C. 400mm
D. 800mm
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How can an administrator determine if a router has been configured when it is first powered up?()
A configured router prompts for a password
B. A configured router goes to the privileged mode prompt
C. An un configured router goes into the setup dialog
D. An un configured router goes to the enable mode prompt
汽轮机主油箱装设排烟风机主要是为了排除油箱内气体和有利于轴承回油。()
A. 正确
B. 错误
国际比赛用球周长()厘米,重量260-280千克,气压为0.3-0.325千克/平方厘米。