【简答题】凡是对元素的保存次序与使用顺序相反的,都可以使用 。
【简答题】导管分子的五种类型分别是______________、______________、______________、______________、______________。
【判断题】新能源汽车的核心部件是电池、电机、电控。
【单选题】一质量为m的物体放在匀角速转动的水平转台上,物体与转轴的距离为r。如物体与转台表面的磨擦系数为f,则物体不会因转台旋转而滑出的最大速度为_______
【简答题】质量为 m 的物体放在匀速转动的水平转台上,它与转轴的距离为 r ,如图 a 所示。设物体与转台表面的摩擦因数为 f ,求当物体不致因转台旋转而滑出时,水平台的 最大转速。
【单选题】According to the author, what is the best way to offer aid to underdeveloped countries?
A.
Getting your priorities in order.
B.
Giving help permanently.
C.
it a permanent endeavor.
D.
Providing whatever is needed at any time.
【简答题】导管分子的五种类型分别是______________、______________、______________、______________、______________。(答案间请用顿号隔开;类型后不需要加“导管”两字)
【单选题】What does the author mean by the last sentence?
A.
Recycling would be concluded in Olympic s in the future.
B.
Recycling will become an integral feature of the Olympic s.
C.
Recycling is likely to be selected as one sport in the future.
D.
Recycling is as important as Olympic s.
【单选题】凡是元素的保存次序与使用顺序相反的,都可以使用( )。