单项选择题
轴力沿着横截面的法线方向（ ）
A．对
B．错
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单项选择题What is the serving order in Chinese dinner table?
A、From soups to meat dishes, then vegetable plates, cold dishes, pastries and the last fruit
B、From cold dishes to meat dishes, then vegetable plates, soups, pastries and the last fruit
C、From cold dishes to meat dishes, then fruit, vegetable plates, soups and the last pastries
D、From soups to cold dishes, then vegetable plates, meat dishes, fruit and the last pastries