【单选题】【消耗次数：1】
渐开线直齿圆柱齿轮传动的重合度是实际啮合线段与______的比值。
①
齿距
②
基圆齿距
③
齿厚
④
齿槽宽
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渐开线标淮直齿圆柱齿轮正确啮合条件为[填空1]
【单选题】
一渐开线直齿圆柱标准齿轮，已知齿数z=25，齿距p=12.566mm，压力角a=20。，齿顶高系数ha*=1，顶隙系数c*=0.25。齿厚（ ）。
①
3.14
②
6.28
③
8
④
12.56
【单选题】
一渐开线直齿圆柱标准齿轮，已知齿数z=25，齿距p=12.566mm，压力角a=20。，齿顶高系数ha*=1，顶隙系数c*=0.25。分度圆直径（ ）。
①
50mm
②
75mm
③
100mm
④
200mm
【单选题】
一渐开线直齿圆柱标准齿轮，已知齿数z=25，齿距p=12.566mm，压力角a=20。，齿顶高系数ha*=1，顶隙系数c*=0.25。齿根圆直径（ ）。
①
90mm
②
92mm
③
96mm
④
108mm
随机题目
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His salary as a driver is much higher than ______.
①
a porter
②
is a porter
③
that of a porter
④
as a porter
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We’ve missed the last bus, I’m afraid we have no _______ but to take a taxi.
①
way
②
choice
③
possibility
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selection
【单选题】
England is an island country. _______ consists of three principal islands, and _______ climate is generally mild.
①
She；her
②
She；its
③
He；his
④
It；its
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There was so much noise in the classroom that the teacher couldn’t make himself _______.
①
heard
②
hearing
③
to hear
④
hear
【单选题】
He will surely finish the job on time _______ he is left to do it in his own way.
①
in that
②
in case
③
as far as
④
so long as
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When the girl heard the news, she could do nothing but ______ back home.
①
going
②
went
③
to go
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go
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Due to the fact that she was naturally timid, she shrank from any ____ social and cultural activities.
①
comprehension of
②
study on
③
success in
④
participation in
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The shop offers almost everything（）ranges from inexpensive to very expensive.
①
that
②
which
③
who
④
in which
【单选题】
I am unhappy because she accepted my invitation _______ .
①
passively
②
extremely
③
undoubtedly
④
unwillingly
【单选题】
It’s getting late and I have to leave now.____________
①
So soon! I hope youve enjoyed it.
②
Have a cup of tea.
③
Not at all.
④
How about a cup of coffee?