下列有关工业生产的叙述正确的是()。
A.合成氨生产过程中将NH3液化分离,可加快正反应速率,提高N2、H2的转化率
B.电解精炼铜时,同一时间内阳极溶液铜的质量比阴极析出铜的质量小
C.硫酸工业中,在接触室安装热变换器是为了利用S03转化为H2S04时放出的热量
D.电解饱和食盐水制烧碱采用离子交换膜法,可防止阴极室产生的Cl2进入阳极室
第4题
A.can
B.may
C.should
D.had to
第6题
He might do it, and so ______.
A.might his best friend
B.his best friend may
C.will his best friend
D.his best friend should
第7题
Beethoven was distressed by his nephew's ______.
A.extravagance
B.unwillingness to do his best
C.joining the army
D.failure to enter polytechnical school
第8题
Beethoven was distressed by his nephew's ______.
A.extravagance
B.unwillingness to do his best
C.joining the army
D.failure to enter polytechnical school
第9题
Beethoven was distressed by his nephew's ______
A.extravagance
B.unwillingness to do his best
C.joining the army
D.failure to enter polytechnic school
第10题
Everyone who was late ______ .
A.was asked to give the reason for his being late
B.could do nothing but ask the manager to excuse him
C.should put "ditto" below his name on the paper
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