单项选择题

函数在点处的梯度等于( )
A、
B、
C、
D、
E、
F、
G、
H、

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Non-destructive testing sometimes destroys the structure and function of mechanical parts.

答案：错误

单项选择题

Listening to lots of new materials, and never stick on to one piece of material.

A．对
B．错