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【判断题】
列管式换热器的折流板的安装固定是通过拉杆和定距实现的,其中拉杆的直径不得小于 10mm 。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】I regretted not having finished my composition last night, I to the cinema with Mary.
A.
shouldn’t have gone
B.
might have gone
C.
needn’t have gone
D.
must have gone
【单选题】Not having finished his homework, ______ to watch TV.
A.
Mother forbade him
B.
so he was forbidden
C.
and he wanted
D.
he was forbidden
【单选题】锰和镍（Ni）都是金属元素，将镍丝插入MnSO 4 溶液中无变化，插入CuSO 4 溶液中，镍丝上有红色固体析出．Mn、Ni、Cu三种金属的活动性由弱到强的顺序是（ ）
A.
Mn、Ni、Cu
B.
Ni、Cu、Mn
C.
Cu、Ni、Mn
D.
Mn、Cu、Ni
【单选题】_____ he has tried his best, I don’t mind his not having finished the task on time
A.
As soon as
B.
As well as
C.
So far as
D.
So long as
【简答题】交易文件的完整性得以保证是因为应用了
【单选题】Not having finished his homework,_____ to watch TV.
A.
mother forbade him
B.
so he was forbidden
C.
and he wanted
D.
he was forbidden
【单选题】Not having finished their jobs, _____ to leave the company.
A.
the boss forbade them
B.
they were forbidden
C.
so they were forbidden
D.
and they preferred
【单选题】锰和镍（Ni）都是金属元素，将镍丝插入MnSO 4 溶液中无变化，插入CuSO 4 溶液中，镍丝上有红色固体析出。Mn、Ni、Cu三种金属的活动性由强到弱的顺序是 [ ]
A.
Cu、Mn、Ni
B.
Mn、Ni、Cu
C.
Ni、Cu、Mn
D.
Mn、Cu 、Ni
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