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【简答题】
linux中常用的网络诊断工具有ping 命 令 、 traceroute 命令和 netstat 命令,简述他们的作用?
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【单选题】Rotating shafts particularly those that run at high speeds, must be designed to avoid operation at speeds.
A.
. low
B.
.overload
C.
critical
D.
hollow
【单选题】Engine speeds at which resonance can occur are termed ______.
A.
maximum speeds
B.
sea speeds
C.
full speeds
D.
critical speeds
【单选题】Engine speeds at which resonance can occur are termed ____.
A.
maximum speeds
B.
full speeds
C.
sea speeds
D.
critical speeds(临界转速)
【单选题】Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an __________.
A.
engine support vibration isolator
B.
detuner or viscous fluid damper
C.
lightened crankshaft flywheel
D.
spherically seated crankshaft bearing
【单选题】Engine speeds at which resonance can occur are termed _____.注:resonance 共振
A.
maximum speeds
B.
full speeds
C.
sea speeds
D.
critical speeds
【单选题】Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an _____.
A.
spherically seated crankshaft bearing
B.
engine support vibration isolator
C.
detuner or viscous fluid damper
D.
lightened crankshaft flywheel
【简答题】汽车的公害包括哪些方面？发动机排放的有害气体主要有哪几种？
【简答题】汽车公害的内容，实现汽车环保的途径有哪些。
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