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【单选题】
采用比例调节器和电动比例操作器的辅锅炉蒸汽压力控制系统图,当锅炉负荷增大时,测量划针和反馈划针的移动方向分别为____A.
,
B.
,右移
C.
右移,
D.
右移,右移
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参考解析：
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皮皮学刷刷变学霸
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【判断题】RFID 不仅可以帮助一个企业大幅提高货物、信息管理的效率,还可以让销售企业和制造企业互联,从而更加准确地接收反馈信息,控制需求信息,优化整个供应链。
A.
正确
B.
错误
【单选题】We can never forget the days _______ the two astronauts in spaceship worked together and the days ________ we spent together.
A.
when; which
B.
which; when
C.
what; that
D.
on which; when
【单选题】We can never forget the days _______the two astronauts in spaceship worked together and the days _______we spent together.
A.
which; when
B.
when; which
C.
what; that
D.
on which; when
【简答题】阅读理解。 'There are 365 days in a year. We sleep 8 hours a day,so we have 122 days for sleeping. Then our work time has 243 days left. But there are 52 weekends in a year. Each weekend is two days. We lo...
【单选题】I can never forget the days________we worked together and the days________we spent together. [ ]
A.
on which；when
B.
which；when
C.
what；that
D.
when；which
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