电液调节系统中转速给定和负荷给定各有什么作用？为什么设置转速给定值形成模块？
“一词多义”现象，属于影响沟通的（）障碍。 ["文化","社会","心理","认识"]
Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（） ["grinding the spare plunger to the barrel","replacing the plunger and the barrel","highly polishing both the plunger and barrel","replacing plunger only"]
Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（） ["Control the amount of lube oil burned in the combustion chamber","Transmit heat from the piston to the cylinder liner","Prevent damage to ring groove inserts by acting as a heat dam","Dissipate combustion chamber gas pressure by channeling it through the ring ga"]
新造客车穿线钢管弯曲线弯角不应小于（），弯曲半径处不应有皱折。 ["45°","60°","90°","120°"]
什么是甲板室？
