脂餐的基本原理是()
A.胆囊收缩
B.胆管收缩
C.刺激十二指肠黏膜释放缩胆囊素
D.胃蠕动增加
参考答案:C
The information you give in the application is too general. You should _______ something special about yourself.
A.spy on
B.rely on
C.focus on
D.cut back on
滑移齿轮与轴的联接主要采用普通平键的联接形式。