【简答题】作用在物体上的一群力称为 ,对同一物体的作用效应相同的两个力系称为 。
【单选题】Combine two short sentences into a long one. Select the correct one. She stayed in bed. The doctor told her to do so.
A.
She stayed in bed but the doctor told her.
B.
The doctor told her she stayed in bed.
C.
She stayed in bed the doctor told her.
D.
She stayed in bed as the doctor told her.
【单选题】同时作用在同一物体上的两个或两个以上的力称为( )。
【单选题】— The doctor told me____ too much but I find it difficult. — The doctor is right. The less you drink, ____ you will be.
A.
don't drink; the healthier
B.
not to drink; the healthier
C.
not to drink; the more healthier
D.
don't drink; healthier
【多选题】力系是指 。 称为等效力系。 称为力系的等效替换。 称为力系的简化。 称为该力系的合力,而将该力系的各力称为 。如果某一物体上作用了一个力系,而该物体能保持平衡状态,则将该力系称为 。
B.
若对于同一物体,有两组不同力系对该物体的作用效应完全相同,则将这两组力系
【单选题】药品的纯度检查是检查项目下的主要内容,它是对药物中的( )进行检查。
【单选题】下方固定、左侧嵌套的框架集默认有( )个子框架网页
【单选题】药品的纯度检查是检查项目下的主要内容,是对药物中的( )进行检查。