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【单选题】
带传动工作工程中,带中产生的瞬时最大应力发生在( )处。A.
进入小带轮处
B.
紧边进入小带轮处
C.
退出大带轮处
D.
紧边退出大带轮处
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反馈参考答案：
举一反三
【单选题】用草酸钠做基准物质标定高锰酸钾溶液时。开始反应速度较慢,稍后反应速度明显加快,这是( )起催化作用。
A.
H +
B.
MnO 4 -
C.
Mn 2+
D.
CO 2
【简答题】Who asked the author such a question?
【单选题】The author became a little impatient for ____.
A.
he couldn't stand up with the shoe repairer's modest attitude
B.
he was in a hurry to meet a friend
C.
the shoe repairer was sad and did nothing about his torn shoes
D.
it took the shoe repairer a long time to have his shoes repaired
【单选题】The author wanted to get the job _____
A.
to meet a husband
B.
to train as a nurse
C.
to support herself in her education
D.
to support her aged parents
【单选题】We can't _____ one to change the habits of a lifetime in a short time.
A.
hope
B.
wait
C.
expect
D.
imagin
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