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搜题
【单选题】
The author realized that the Expo was the perfect place to get feedback from ________.
A.
buyers’ constructive criticism
B.
thousands of different exhibitors
C.
experts in wholesale industry
D.
the front line of retail industry
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【单选题】关于平面力的投影,以下说法哪个是正确的?( )
A.
力的投影大小等于力的大小
B.
力的投影是矢量
C.
力在坐标轴上的投影就是该力的分力
D.
力可以由它的投影确定大小和方向
【单选题】This graphic shows the results of an attempt to open a Telnet connection to router ACCESS1 from router Remote27. Which of the following command sequences will correct this problem? ()
A.
ACCESS1(config)# line console 0 ACCESS1(config-line)# password cisco
B.
Remote27(config)# line console 0 Remote27(config-line)# login Remote27(config-line)# password cisco
C.
ACCESS1(config)# line vty 0 4 ACCESS1(config-line)# login ACCESS1(config-line)# password cisco
D.
Remote27(config)# line vty 0 4 Remote27(config-line)# login Remote27(config-line)# password cisco
E.
ACCESS1(config)# enable password cisco
F.
Remote27(config)# enable password cisco
【简答题】已知一标准直齿圆柱齿轮副,其传动比i=3,主动齿轮转速n 1 =750r/min,中心距a=240mm,模数m=5mm,试求从动轮转速n 2 ,以及两齿轮齿数Z 1 和Z 2 。
【判断题】力的投影就是力的分量
A.
正确
B.
错误
【判断题】力在轴上的投影就是力沿坐标的分量。
A.
正确
B.
错误
【简答题】已知一对标准直齿圆柱齿轮传动,其传动比i 12 =2,主动轮转速n 1 =400r/min,主动齿轮分度圆直径d 1 =80mm,模数m=4,求(1)从动轮转速n 2 ; (2)两齿轮的齿数z 1 ,z 2 。
【简答题】牛顿粘性定律表达式为____________,其粘性系数(粘度)的物理意义是____________。
【单选题】He told her that he ________ soon.
A.
left
B.
was leaving
C.
is leaving
D.
had left
【判断题】An attempt to open a nonexistent file for input generates a syntax error.
A.
正确
B.
错误
【单选题】He told her that he worked for the Corporation_________________.
A.
simply
B.
in a simple way
C.
and no more
D.
only
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