“一朝被蛇咬，十年怕井绳”中蕴含了反射知识。下列有关说法正确

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问题选择题

“一朝被蛇咬，十年怕井绳”中蕴含了反射知识。下列有关说法正确的是[ ]

A．该反射是先天性的

B．该反射的神经中枢在脊髓

C．该反射必须经过大脑皮层

D．该反射的神经中枢在小脑

答案

答案：C

填空题

国际A系列图纸A3的尺寸是（）mm。

单项选择题

When working with lumber, wire and staples are not desirable to be used because（）.

A.they are not subjected to cause trouble

B.they are difficult to handle this kind of cargo

C.the efficiency of separating is raised

D.the efficiency of loading is greater