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【单选题】
在一般工作条件下,齿面硬度HB≤350的闭式齿轮传动,通常的主要失效形式为A.
轮齿疲劳折断
B.
齿面疲劳点蚀
C.
齿面胶合
D.
齿面塑性变形
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皮皮学刷刷变学霸
举一反三
【单选题】You _____ if you had spoken the truth out. But you were as quiet as a mouse. [ ]
A.
mustn't have been blamed
B.
shouldn't be blamed
C.
wouldn't have been blamed
D.
couldn't be blamed
【简答题】求下列函数的微分： (1)y=a cos3x (a＞0)； (2)y=(1+x 2 ) xesx
【简答题】9-1 上面(5)、(6)求偏导数 5. 求下列函数的定义域: 9-2 求下列函数的偏导数:(5) 9.验证: 9-3 求下列函数的全微分:
【简答题】求下列函数的微分 (1) (2) (3)设y=y(x)满足方程xy-e x +e y =0，求dy
【单选题】If you had spoken clearly, you _______.
A.
would have been understood
B.
be understood
C.
can understand
D.
can be understood
【单选题】If you had spoken more clearly, you______.
A.
would understand
B.
would be understood
C.
would have been understood
D.
would have understood
【简答题】求下列函数的微分: (1) (2) (3) (4)
【单选题】298K时，反应Zn+Sn4+= Sn2+(1.0mol·dm-3)+Zn2+(1.0mol·dm-3)组装成原电池，测得电动势为0，则c(Sn4+)应为（）mol·dm-3（已知jϴ(Zn2+/Zn) = -0.76V，jϴ(Sn4+/Sn2+) = 0.15V）
A.
1.0
B.
4.25×10 -16
C.
1.81×10 -31
D.
0.86
【单选题】If you had spoken clearly, you would ______ .
A.
understand it
B.
have understood
C.
be understood
D.
have been understood
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