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【单选题】
可以通过控制脉冲个数来控制角位移量，从而达到准确定位的目的；可以通过控制脉冲频率来控制电机转动的速度和加速度，从而达到调速的目的。这是（ ）A.
步进电机
B.
交流伺服电机
C.
异步电机
D.
直流伺服电机
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【单选题】关于柴油机下列说法中,最准确的是:
A.
柴油机是以柴油为燃料的热力发动机
B.
柴油机是将燃料的热能转换为机械能的内燃机
C.
柴油机是压燃式内燃机
D.
柴油机是一种两次能量转换都在气缸内进行的点燃内燃机
【简答题】There&39;s no question that the Earth is getting hotter. The real questions are: How much of the warming is our fault, and are we 1 to slow the devastation by controlling our insatiable 2 for fossil f...
【单选题】关于柴油机下列说法中，最准确的是：（）
A.
柴油机是以柴油为燃料的热力发动机
B.
柴油机是将燃料的热能转换为机械能的内燃
C.
柴油机是压燃式内燃机
D.
柴油机是一种两次能量转换都在气缸内进行的点燃内燃机
【简答题】While many young people may resist getting a 'real job' or becoming independent, these are the things that make you happy and give you purpose. Some people underestimate the satisfaction of working, t...
【单选题】Speaker:I’m so sorry. I’m late. Speaker:___________
A.
You’re welcome.
B.
. It doesn’t matter.
C.
I’m so sorry too.
【单选题】Whats the real meaning of the phrase 'in the ring' (Line 6, Para. 3)?
A.
Getting the ring as a symbol of the non-GMO label.
B.
Fighting with other companies in a boxing ring.
C.
Calling other other companies to apply for the non-GMO certification.
D.
Competing with other companies for the non-GMO certification.
【单选题】Speaker A: I’m so sorry. I’m late. SpeakerB:________________
A.
You're welcome
B.
It doesn't matter
C.
I'm so sorry too.
【简答题】As a child,I was truly afraid of the dark and of getting lost;these fears were very real and caused me some uncomfortable moments. Maybe it was the strange__36 things looked and sounded in my familiar...
【单选题】Getting Home which _____ a real-life event, is a very touching film. [ ]
A.
based on
B.
bases on
C.
is based on
D.
is basing on
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