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【单选题】
一对相互啮合的直齿圆柱齿轮,下列说法错误的是( )A.
小齿轮齿廓弯曲,大齿轮齿廓平直
B.
小齿轮基圆齿,大齿轮基圆齿厚大
C.
小齿轮齿顶圆压力角小,大齿轮齿顶圆压力角大
D.
小齿轮转速高,大齿轮转速低
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【简答题】用所给单词恰当形式填空 I stayed four years, worked harder than I __________________ (dream) of working before, and enjoyed every minute of it.
【单选题】某板框过滤机,在恒定的操作压差下过滤某种水悬浮液,过滤介质阻力可忽略不计。经两个小时后,滤渣刚好充满滤框,得到滤液 15.0m 3 ,则第一小时可得滤液为 ___ ____ m 3 。
A.
7.5
B.
10.0
C.
10.6
D.
缺条件，无法计算
【单选题】听力原文：W: Your spoken English is very good. I like it very much． M: Thank you! You see, I've ever stayed in England for five years and during that time my oral English was improved a lot. Q: How long di...
A.
Two years.
B.
Three years.
C.
Four years.
D.
Five years.
【单选题】某板框过滤机,在恒定的操作压差下过滤某种水悬浮液,经两小时后,滤渣刚好充满滤框得滤液 15m 3 ,则第一小时可得滤液为: _________ 。(过滤介质阻力略而不计)
A.
7.5m 3
B.
10m 3
C.
m 3
D.
缺条件 , 无法计算
【简答题】I stayed four years, worked harder than I had ever______________ working before, and enjoyed every minute of it.
【单选题】板框过滤机,在恒定的操作压差下过滤某种水悬浮液,经两小时后,滤渣刚好充满虑框,得滤液 15 m 3 ,则第一小时可得滤液为( )。(过滤介质阻力不计)
A.
7.5 m 3
B.
10 m 3
C.
15 ／ √ ２ m 3
D.
缺条件，无法计算
【简答题】Every year Chris Brogan posts his three words for a new year. Many others and I have followed his lead for the past three or four years. They helped me a lot. My words for last year were“passion”, “fo...
【单选题】--Have you ever been here before? ---Well, I once _________ here for four years. Those days are really unforgettable.
A.
have stayed
B.
had stayed
C.
have been staying
D.
stayed
【简答题】Every year Chris Brogan posts his three words for a new year. many others and I have followed his lead for the past three or four years. They helped me a lot. My words for last year were “passion”, “f...
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