什么叫机械？
参考答案：
各种零件和机构的组合体称机械。
191. Things went well for him during his early life but in middle age his__________seemed to change.
A．chance
B．success
C．way
D．Luck
以下，（）是法式宴会的上菜方式。
A、家庭式
B、台前托让式
C、餐台自取式
D、客人传递式
