皮皮学,免费搜题
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搜题
【单选题】
According to paragraph 2, if you use $100 of your credit and repay it in 20 days, how much interest will you pay?
A.
70 cents.
B.
60 cents.
C.
80 cents.
D.
50 cents.
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【单选题】What is the electrode holder used to hold?
A.
Workpiece
B.
electrode
C.
C
D.
D
【判断题】The electrode holder is used to hold the tungsten electrode.
A.
正确
B.
错误
【简答题】在图5所示稳压电路中,已知【图片】=10V,【图片】=5V,【图片】=10mA,【图片】=500Ω,则限流电阻【图片】应为______Ω。【图片】 图5
【判断题】The electrode holder is used in shielded metal-arc welding.
A.
正确
B.
错误
【判断题】The electrode holder is fastened to the negative pole of the generator in straight polarity.
A.
正确
B.
错误
【简答题】The electrode holder is connected to the welding machine with a cable.
【判断题】Work clamp is used to connect the electrode holder to the welding machine.
A.
正确
B.
错误
【简答题】已知图中U1=2V,U2=-8V,则UAB= ()V 【图片】
【单选题】在图5所示稳压电路中,已知【图片】=10V,【图片】=5V,【图片】=10mA,【图片】=500Ω,则限流电阻【图片】应为______。【图片】 图5
A.
1000Ω ;
B.
500Ω ;
C.
250Ω ;
D.
200Ω 。
【单选题】图示电路原已稳定,已知:【图片】= 10 V,【图片】=60V,【图片】=0时将开关S闭合,则时间常数【图片】=( )。【图片】
A.
0.04 s
B.
0.25 s
C.
0.1 s
D.
0.2 s
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