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【单选题】
双面印刷电路板片式元器件安装其工艺流程应该是()。A.
同时贴装两面片式元器件，然后两面同时焊接
B.
先贴装正面后贴装反面元器件，最后焊接
C.
先贴正面元器件、焊接，然后再贴反面元器件再焊接
D.
同时贴装两面片式元器件，然后先焊正面，后焊反面
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【单选题】楼梯踏步的计算公式常为: ( ) ,其中 h 为踏步高, b 为踏步宽。
A.
h+b=600
B.
2h+b=660 mm
C.
h+b=450 mm
D.
2h+b=450 mm
【单选题】The writer seems to hope that______.
A.
most of the lottery money will be used for cancer research
B.
most of the lottery money will go to charity
C.
people will give more money to charity
D.
people will spend more money on the National Lottery
【多选题】楼梯踏步的计算公式常为( ),其中h为踏步高,b为踏步宽。
A.
h+b=600mm
B.
2h+b=600~620mm
C.
h+b=450mm
D.
2h+b=450mm
E.
h+2b=600mm
【多选题】楼梯踏步的计算公式常为（），其中h为踏步高，b为踏步宽。
A.
h+b=600mm
B.
2h+b=600mm
C.
h+b=450mm
D.
2h+b=450mm
E.
h+2b=600mm
【多选题】楼梯踏步的计算公式常为 ( ) ,其中 h 为踏步高, b 为踏步宽。
A.
2h+b=600mm
B.
2h+b=450mm
C.
h+b=450mm
D.
h+b=500mm
【简答题】As we know, most of the material things in our daily life have to be bought with money. But money is not all powerful. Money can't buy many things such as time and true love. There are 24 hours in a d...
【单选题】(Track lighting) is one of the most popular types, (if not) the most popular type, (of) lighting (on market) today.
A.
Track lighting
B.
if not
C.
of
D.
on market
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