发生火灾时,可以断电的应断电灭火,无法断电的带电灭火。
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Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?()
A. Planetary gear set
B. Torsional vibration damper
C. Friction clutch
D. Air bladder clutch
顾客的购买动机除了产生于需要外,还时常受到外界刺激的影响,刺激越多越强烈,购买就越有可能。所以如何在恰当的时间、地点给顾客以必要的刺激是推销人员应该着重研究的关键问题。
A. 正确
B. 错误