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【多选题】
造成液压缸爬行的原因（）A.
空气混入
B.
油粘度过大
C.
工作环境太差
D.
活塞杆弯曲变形
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反馈参考答案：
举一反三
【简答题】Alkanes undergo reactions such as cracking, alkylation, oxidation, halogenation, nitration and so on.
【多选题】What does commission mean?
A.
It's a reward given to an agent.
B.
It's based on the percentage of the sale.
C.
It's in proportion to the price at which the goods are bought or sold.
D.
It is paid to a salesperson for every sale that he or she makes.
【简答题】Alkanes undergo reactions such as cracking, alkylation, oxidation, halogenation, nitration and so on.
【单选题】What kind of information does the man read about?
A.
A discount on computer monitors
B.
A sale on hard drives
C.
A new computer technology
D.
A job opening at a computer manufacturer
【单选题】What does the phrase' on the ropes' ( L7, Para2 ) mean?
A.
For sale.
B.
Be defeated completely.
C.
Lose reputations.
D.
The end of one's glory.
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