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【单选题】
单片机晶振频率fosc=12MHz,则一个机器周期为()μS。A.
12
B.
1
C.
2
D.
1/12
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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) (2) (3)
【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 more clearly, you______.
A.
would understand
B.
would be understood
C.
would have been understood
D.
would have understood
【简答题】9-1 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) (4)
【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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