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【多选题】
从自动下降继电器的电路图分析,哪几个插脚是控制自动下降继电器工作的 ( )A.
8/30脚
B.
6/S1脚
C.
4/67脚
D.
5/S2脚
E.
2/87a脚
F.
以上插脚都是
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皮皮学刷刷变学霸
举一反三
【单选题】This year we' 11 produce ______ steel as we did last year.
A.
three times as much
B.
as three times much
C.
as much three times
D.
three times much as
【单选题】From the first three paragraphs, we can infer that
A.
the author would prefer playing with his three older siblings to staying with his grandpa.
B.
they were living in the suburbs where there were not too much traffic on the road.
C.
the grandpa was always the one to babysit for the author and his siblings.
D.
the author enjoyed the time that he spent with his grandpa.
【单选题】We’ll have a sports meet for the next three days.________, we won’t have lessons for three days. [ ]
A.
In other words
B.
On the other hand
C.
For one thing
D.
As a matter of fact
【单选题】现测定套管换热器的总传热系数。数据如下:甲苯在内管中流动,流量为 5000kg ·h -1 , 甲苯的比热容为 1.89kJ × kg -1 × K -1 ,进口温度为 80 °C,出口温度为 50 °C;水在环隙中流动,进、出口温度分别为 15 °C和 30 °C。逆流流动,冷却面积为 2.5m 2 。求传热平均温度差和总传热系数
A.
42.06 ， 749.02
B.
38.18 ， 825.06
C.
42.06 ， 825.06
D.
38.18 ， 749.02
【单选题】We talked for morn than three hours without ______ a cup of tea.
A.
to have
B.
having
C.
have
D.
had
【简答题】水平子系统又称为 子系统
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