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【单选题】
In the past few years, a great many teachers have found very important to teach their students how to learn.A.
this
B.
that
C.
one
D.
it
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反馈参考答案：
举一反三
【单选题】－_____ I swim in that river? －No, you _____. It's dangerous to swim in it. [ ]
A.
Must; can't
B.
Can; may
C.
Must; needn't
D.
May; mustn't
【简答题】锅炉的工作过程包括燃料的燃烧过程、( )和( )。
【单选题】—_____ I swim in that river? —No, you ______. It's dangerous to swim in it. [ ]
A.
Must; can't
B.
can't; may not
C.
May; mustn't
D.
Must; needn't
【多选题】一般蒸汽锅炉的基本工作过程包括
A.
通过燃烧 将燃料中的化学能释放出来，变成高温烟气的热能
B.
通过受热面将烟气的热能传递给工质，变为工质的热能
C.
工质吸热发生热力参数的改变，如温度升高、发生相变等
D.
高温蒸汽在喷管中膨胀做功将热能变成动能
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