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【单选题】
两个标准直齿圆柱外齿轮的分度圆直径和齿直径分别相等。其中一个是短齿制,即齿系数h* =0.8.頂隙系数c*=0.3。那末,如下关于模数m、齿数z、齿根圆直径df和齿顶圆上渐开线曲率半径ρ.的论断中,哪一条是错误的?A.
m短齿>m正常
B.
Z短齿>Z正常
C.
df短齿>df正常
D.
ρ短齿>ρ正常
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举一反三
【单选题】Is there ________ in today's paper? [ ]
A.
important something
B.
important anything
C.
something important
D.
anything important
【单选题】--Is there ________in today’s newspaper? --No , nothing is important.
A.
anything important
B.
important anything
C.
something important
【单选题】Is there _______ in today's newspaper? [ ]
A.
important something
B.
nothing important
C.
important anything D . anything important
【单选题】Money is important ______ it’s not the most important thing.
A.
and
B.
but
C.
or
D.
so
【简答题】A．It's just as important as other jobs. B．It's no less important than other jobs. C．It's even more important than other jobs. D．It's not important at all.
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