卧式罐的壁厚应根据其工作对可能承受的最大压力来计算，并在罐内设置必要的刚性（）。
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If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）
A. The cylinder indicator cocks should be opened
B. The sump lube oil scavenge pump should be secured immediately
C. The explosion relief valves should be manually opened
D. The crankcase should remain unopened until the engine has cooled
When resetting a Catalyst Express switch to factory default settings， which three options are available from the Software Recovery window？（）
A. Boot to a password recovery window
Boot with the factory default image
C. Erase the system configuration and boot with the factory default IOS image
D. Erase the system configuration and boot from a TFTP-supplied IOS image
Erase the System Configuratio
地铁车辆重量通过（）传给转向架构架。
A. 金属橡胶弹簧
B. 空气弹簧
C. 液压减震器
D. 金属弹簧
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