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【单选题】
ZD6-D型转辙机炭刷于刷握盒内上下不卡阻,四周无过量,弹簧压力适当,炭刷与换向器呈同心弧面接触,接触面积不少刷面的( )。A.
1/2
B.
1/3
C.
3/4
D.
3/5
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举一反三
【单选题】I wish that you ______ such a bad headache, then you would have enjoyed the concert. [ ]
A.
hadn't had
B.
didn't have
C.
shouldn't have
D.
won't have
【单选题】Some people believe that if you ______ a mirror, you ______ have seven years of bad luck.
A.
break will
B.
will break would
C.
break would
D.
broke will
【简答题】如图所示的四个过程，从能量转化和转移的角度看，属于机械能转化为内能的是
【简答题】电解液由纯硫酸（相对密度1.84）和蒸馏水按一定比例配置而成，相对密度一般为（）。
【简答题】___________ for the job you have applied for will leave a bad impression on the interviews. A．Not prepared B．Not having prepared C．Not prepare D．Not being prepared
【单选题】If you _____ what he said, you could have avoided repeating such a bad mistake.
A.
paid attention to
B.
had paid attention to
C.
noticed
D.
had noticed to
【简答题】电解液为 和 按一定比例配置而成。
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