康有为、梁启超倡导变法的首要目的是（    ）

在水平面上一轻质弹簧竖直放置，在它正上方一物体自由落下，如图所示，在物体压缩弹簧速度减为零的过程中（   ）

When I was young，my father told me that little acts of kindness may give one great happiness. Since then I have always tried to help people in1.
One hot summer afternoon, I was2down the highway to New York when another car suddenly3into my lane(车道). My car was in the far right lane，so it ran onto the roadside. As a(n) 4driver，I moved my car quickly and skillfully back onto the highway without causing any accident.
I was5with that driver，but I thought that he just did not pay attention to the lane change, and he 6did not do that on purpose(故意).The car ran away7after cutting me off. Very soon it disappeared from sight. After a while，I came around a curve(弯道) and found the8car. The driver was walking along the roadside. He was an elderly man and looked9. With no telephone nearby and the nearest services twenty miles away. I decided to 10and see what the problem was.
The man’s car had a flat tire(瘪胎). Although he had a spare tire，he had nothing to work with. I decided to11him. I changed the tire for him and allowed him to sit in my Air-conditioned car while I did it. Fifteen minutes later，I12the work. I was hot and tired，but I really felt13after an act of kindness to the man who had earlier14my car ran off the road.
You can really enjoy great15from kindness acts, so always lend your hands to others in trouble.

一个圆锥和一个圆柱的底面积相等，体积也相等．已知圆柱的高是1厘米，圆锥的高是（　　）厘米．

将以上物质分别填入下面对应的横线上，组成一个为配平的化学方程式．

____ +____+____→____ +____+H₂O．