如果要在单击命令按钮时执行一段代码，则应将这段代码写在______事件过程中。
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—Would you like me to help you with the maths problem?
—___________ It’s a most difficult one.
A．With pleasure.
B．Why not?
C．That’s all right.
D．It’s my pleasure.
肱骨干骨折最易引起
A．尺神经损伤
B．桡神经损伤
C．腋神经损伤
D．肌皮神经损伤
E．正中神经损伤
