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【单选题】
已知一对外啮合正常齿标准直齿圆柱齿轮,其小齿轮齿数 Z 1 =20 ,传动比 i 12 =2.5 ,压力角 α =20 °,模数 m =10mm, h a * =1, c * =0.25 。试求: (1) 大齿轮齿数z 2 、分度圆半径 r 2 、齿顶圆半径 r a2 和齿根圆半径 r f2 ;(2) 齿距p, 齿 厚 s ,标准中心距 a, 请 认真计算后,选择正确的答案( )
A.
z2=40、r2=200mm、ra2=205mm,rf2=190mm；p=31.42mm,s=15.71mm,a=300mm.
B.
z2=40、r2=400mm、ra2=405mm,rf2=390mm；p=31.42mm,s=15.71mm,a=600mm.
C.
z2=50、r2=500mm、ra2=520mm,rf2=475mm；p=31.42mm,s=15.71mm,a=700mm.
D.
z2=50、r2=250mm、ra2=260mm,rf2=237.5mm；p=31.42mm,s=15.71mm,a=350mm.
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Compulsory benefits demanded by the government.
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Health-education program.
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Increasing number of retirees.
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Hospital and doctor fees.
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【简答题】空气流量传感器,一般安装在( )上。其作用是检测发动机进气量的大小,并将进气量信息通过电路的连接转化为电信号输入给ECU,以供ECU确定( )和( )。
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【单选题】_________to train his daughter in computer, he put an ad like this in the paper, “_________, a computer teacher for a ten-year-old girl.”
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Compulsory benefits demanded by the government.
B.
Health-education program.
C.
Increasing number of retirees.
D.
Hospital and doctor fees.
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