如图是伽利略根据可靠的事实进行的理想实验和推论的示意图．请填入合适内容，完成对各示意图的说明．

①如图所示，把两个斜面对接，让小球由静止开始从左侧斜面上高为h处滚下，如果没有摩擦，小球将达到右侧____高度的斜面上．（选填“相同”或“不同”）

②如图所示，如果减小右侧斜面的倾角，小球到达右侧斜面上的高度____（选填“大于”、“等于”或“小于”）原来的高度h，但要通过更长的距离．

③如图所示，继续减小右侧斜面的倾角，直到使它成为水平面，小球因不可能达到原来的高度h，就要沿着水平面以____（选填“恒定”或“变化”）的速度持续运动下去．

④伽利略在该实验中所使用的科学研究方法是____．（选填“等效替代法”、“理想实验法”或“控制变量法”）

根据短文内容和所给中文提示，在空白处写出单词的正确形式。每空限填一词。

Dear Future Me,

You are leaving school and stepping into a new world. Well done for completing all ____  (那些) difficult lessons!

You've just found out that you've ____  (通过) all your exams and done your best. You know you'll be able to____  (进入) the fantastic high school. At this moment you must be____ (骄傲的) of yourself.

I'm writing this letter to remind you ____ (再一次) about all the things you wanted to do when you were in the____ (第七) grade. I want you to make sure that before you leave school you'll realise your____ (梦想) as Footballer of the School. Remember that you wanted to be a famous ____ (歌手)? Well, I hope you'll win the top role in the school talent show this year.

If you've done ____  (每件事) you wanted to do, you'll now be a popular and____  (聪明的) student, with a successful future ahead of you.

Don't let me down!

求货车以36km/h的速度空载匀速行驶时，10s内货车牵引力做的功；

硼氢化钠（NaBH₄）( 其中氢元素的化合价为﹣1）是一种安全车载氢源．有关硼氢化钠的说法正确的是（  ）