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【单选题】
熔化极气体保护焊时不适用于喷射过渡的保护气体有( )。A.
C02
B.
Ar
C.
Ar+C02
D.
He
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举一反三
【简答题】若X是连续型随机变量,其概率密度函数为 ,则X的分布函数为F(a)=P(X
【简答题】If A=-144,B=abs(A),then sqrt(B)=(_);
【单选题】I tried to get out of the business ______ I found impossible to carry on.
A.
why
B.
which
C.
what
D.
where
【简答题】I tried to get out of the business ________ I found impossible to carry on. A) why B) which C) what D) where
【单选题】Although I tried to concentrate on the lecture, I was distracted by the noise made by the rushing-in girls.
A.
confused
B.
diverted
C.
attracted
D.
distressed
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