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问题 单项选择题

绿液压油箱参数：正常、最大、低油面警告值分别为（）

A.14，18，3±0.4L；

B.16，18，5±0.4L；

C.14，16，3±0.4L

答案

参考答案：A

选择题
— Is there any better way to help my son get rid of the habit of playing computer games?
— To tell you the truth, it's very hard. But we _____ on this problem to improve the situation.

A. were working
B. had worked
C. are working
D. had been working
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单项选择题

T/T指的是（）

A.信汇

B.票汇

C.电汇

D.信用证
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