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It is a wellknown fact that ______ (国家的发展取决于年轻一代的素质).
It is a wellknown fact that ______ (国家的发展取决于年轻一代的素质).
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It is a wellknown fact that ______ (国家的发展取决于年轻一代的素质).
What can we learn about Fight-it? 查看材料
A.It helps the diabetics in financial difficulties.
B.It organizes parties for volunteers once a year.
C.It offers less expensive medicines to diabetics.
D.It owns a wellknown medical website.
A.FA = -7.03kN,FB =FC =5.21kN;
B.FA = -5.64kN,FB =FC =4.57kN;
C.FA = -3.75kN,FB =FC =3.37kN;
D.FA = -2.81kN,FB =FC =4.23kN;
一对角接触球轴承(α=25°)反安装。已知:径向力FrⅠ=6750N,FrⅡ=5700N,外部轴向力FA=2000N,方向如图所示,两轴承的轴向力FaⅠ、FaⅡ分别为()。 (注:内部轴向力Fs=0.68Fr)
A.由于轴承1压紧,FaⅠ=Fa+FsⅡ,FaⅡ= FsⅡ
B.由于轴承1压紧,FaⅠ= FsⅠ,FaⅡ= FsⅠ+Fa
C.由于轴承1压紧,FaⅠ= FsⅡ,FaⅡ= FsⅡ+Fa
D.由于轴承2压紧,FaⅠ= FsⅠ,FaⅡ= FsⅠ+Fa
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