皮皮学，免费搜题
登录
搜题
【多选题】
关于摩擦力下列说法正确的是（ ）A.
磁悬浮列车是靠强磁场把列车从轨道上托起使摩擦减小
B.
滑冰时，因为冰刀与冰面的接触面积小，所以摩擦小
C.
气垫船就是在船和水之间有一层空气垫使航行时阻力减小
D.
如果一切物体间的摩擦都突然消失，则静止在地面上的汽车很容易开动
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】听下面一段材料,回答第1至3题. 1. What can we learn about the man? A. He wasn't in this afternoon. B. He doesn't believe what Mr. Smith said C. He will buy a new light. 2. What did the woman fail to do this afterno...
【单选题】What can we learn from the conversation?
A.
a The man is quite sure that he’ll be accepted by the new company.
B.
b. The man can have 15 days off per year if he works in the new company for three years.
C.
c. The man is now working in a very small company.
D.
d. The man earns about $65,000 at his present job.
【简答题】传统概念把 作为死亡标志,并把死亡过程分为 、 和 三期。
【简答题】听下面一段材料,回答第1-2题. 1. What can we learn about James Black? A. He's a little fat. B. He is interesting. C. He smiles a lot. 2. How are James Black's lessons? A. Boring. B. Interesting. C. Important.
【简答题】听下面一段材料,回答第1-2题. 1. What can we learn about Mr. Brown? A. He is in his office. B. He is at a meeting. C. He is out for a meal. 2. What will the man probably do next? A. Call back. B. Come again. C. Le...
【单选题】What can we learn about Americans studying abroad?
A.
China is a top destination for them.
B.
The number dropped slightly last year.
C.
Most of them study abroad for only one semester.
D.
Most of them want to learn more about other countries.
相关题目：