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【单选题】
齿轮传动中大体有三种齿廓曲线的齿轮,其中 齿轮制造容易、便于安装、互换性亦好,应用最广。A.
渐开线
B.
摆线
C.
圆弧
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举一反三
【单选题】The writer finds it hard to accept the fact that _____________.
A.
many of his good neighbors are growing old
B.
the lady next door who used to yell at him and his brother is now a widow
C.
the life of his neighbors has become very boring
D.
the man in his black suit even wanted to end his own life
【单选题】My English teacher is busy, __________ she always finds time to visit her parents.
A.
and
B.
so
C.
but
D.
or
【单选题】I should say Henry is not ________ much a writer as a reporter.
A.
that
B.
so
C.
this
D.
as
【单选题】In the first paragraph the writer emphasizes the __________ of face-to-face contact in social settings.
A.
nature
B.
limitation
C.
usefulness
D.
creativity
【单选题】When filling up forms, the writer frequently finds that he ______.
A.
can only remember his age and birthplace
B.
doesn't remember who he is
C.
has forgotten some essential facts
D.
is afraid to answer the questions
【简答题】当采用1:1000的比例绘图时,比例尺上的1mm代表实际长度为 。
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