皮皮学，免费搜题
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【单选题】
青春期男性的肺活量约增加A.
500ml
B.
1000～1500ml
C.
2000～30001ml
D.
3500～4000ml
E.
5000ml
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反馈参考答案：
举一反三
【简答题】特许者所拥有的商品、服务、营业技术、商标、标识以及其他可以带来经营利益的特别权利叫(__)。
【简答题】Write out the name of the symbol of Ac ( )
【单选题】The role of the AC contactor ( ).
A.
turn on/off the main circuit
B.
turn on/off the control circuit
C.
protection of main circuit
D.
protection of control circuit
【单选题】The way to change the running direction of ac motor is
A.
Rotor series resistance
B.
Stator series resistance
C.
Adjust the phase sequence of the three-phase power supply
D.
Adjust the phase sequence of two phases in the three-phase power supply
【单选题】From the definition of the AC resistance, with the increase of the DC current, the AC resistance will become .
A.
larger
B.
smaller
C.
remain
D.
negative
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