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【单选题】
若装有定时限过电流保护的线路,其末端变电所母线上有三条出线,各自的过电流保护动作时限分别为1.5s、 0.5s、1s,则该线路过电流保护的时限应该定为( )A.
1.5s
B.
2s
C.
1s
D.
3.5s
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举一反三
【单选题】At no time ______ we are Chinese.
A.
shouldn't we forget
B.
we should forget
C.
should we forget
D.
we shouldn't forget
【单选题】We couldn' t really afford to buy a house so we got it on hire purchase and paid monthly______
A.
investments
B.
requirements
C.
arrangements
D.
installments
【简答题】Should we purchase the machine? Yes or No
【简答题】We should be ______ for the mistake. If we don't take the ______ ．we will be considered ______ .(responsible)
【单选题】We couldn't really afford to buy a house so we got it on martgage purchase and paid monthly ______.
A.
investments
B.
requirements
C.
arrangements
D.
installments
【单选题】We shouldn’t be ashamed of the way we look, ____________?
A.
should we
B.
shouldn’t we
C.
do we
D.
don’t we
【单选题】I don't know to help him. [ ]
A.
how should we do
B.
what we should do
C.
what should we do
【单选题】F or green purchase, we should purchase ________ .
A.
g oods in small packing
B.
goods in large packing
C.
d isposable goods ( 一次性商品 )
D.
g oods with advertising material
【单选题】按装饰部位不同，装饰材料分为( )。
A.
室内装饰材料和室外装饰材料
B.
园林装饰材料和街心小品及雕塑材料
C.
天然石材、人造石材、陶瓷材料、塑料材料
D.
地面装饰材料、墙体装饰材料、吊顶装饰材料
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