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更多“thrive/θraɪv/（）”相关的问题
第6题
他励直流电动机额定数据为：PN =29[kW]，UN =440[V]，IN =76[A]，nN =1000[r／min]电枢回路总电阻Ra
他励直流电动机额定数据为：PN =29[kW]，UN =440[V]，IN =76[A]，nN =1000[r/min]电枢回路总电阻Ra =0.377[Ω]。试求：
(1)该机以500[r/min]的速度吊起TZ=0.8TN负载转矩，在电枢回路应串多大电阻？
(2)用哪几种方法可使TZ=0.8TN的位能负载以500[r/min]的速度稳速下放？求每种方法的电枢回路串联的电阻值
第7题
一台并励直流电动机，额定功率PN=2．2 kW，额定电压UN=220 V，额定效率ηN=80％，额定转速nN=750 r／min，
电枢电路电阻Ra=0．2 Ω，励磁电路电阻Rf=275 Ω。求该电机在额定状态下运行时的输入电流I、励磁电流If、电枢电流Ia、电动势E和电磁转矩T。
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第8题
心电监护时，电极安放部位正确的是（）
A．LA、RA分别放在左、右锁骨中点外下方B．LL、RL分别放在左、右锁骨中线剑突水平处C．胸前电极V（中心导联）V1（胸骨右缘第5肋间）V2（胸骨左缘第4肋间）V4（左锁骨中线第d肋间）V3（V2与V4连线中点）V5（左腋前线平V4水平）V6（左腋中线平V4水平）D．胸前导联位置可根据心肌缺血部位选择
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第10题
We need to make peace with nature. Without natures help, we cannot thrive or even surv
ive on this planet Earth. We all must do our part to safeguard our planet. So, join me and people everywhere by switching off your lights for an hour on Saturday March 27th at 8:30 p.m., your local time. Lets show the world that we are determined to protect the one home we all share.
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第11题
Even the newest gardener realizes that plants die without water; what is not so well known
is that plants die equally decisively, though not so quickly, if they are overwatered. Beginners usually decide to play it safe and keep their potted plants thoroughly wet. In consequence, death by drowning is one of the commonest disasters to befall the plants of a new horticulturist. Plants wither away if they don't get enough water, and this draws attention to their problem. A plant that has been slightly underwatered so that it droops strikes terror into the heart of its new owner. But it will, in fact, recover completely as long as rescue comes in time and the process is not repeated too often. Overwatered plants, unfortunately, do not give any such obvious signal; slowly they cease to thrive and the first visible indication of serious trouble is a yellowing of the lower leaves. Unless the overwatered pot soil is given a considerable period without water, during which time the plant will continue to look wretched, it will suddenly collapse in exactly the same way as the underwatered plant but with no chance of being revived(复活)because the roots have rotted away.
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From the text we can infer a horticulturist is person engaged in ______.
A．growing plants
B．raising birds
C．cutting plants
D．studying the death cause of plants
