三相笼型异步电动机常用的降压起动方法有：_____、星----三角降压起动、自耦变压器降压起动及延边三角形降压起动。

Many boys enjoy _______ football, basketball or baseball

Which do you think is ________, health or wealth？

_______________will not continue if an ongoing operation is changed or deletedA、

29．__________ when you are on the bus or bike．

学校教育心理学的主要研究方法有__________、__________、教育经验总结法、自然实验法、实验室实验法和__________。

Which do you think is _________________important, health or wealth?

And they can ______their passports______，making leaving or “escaping” virtually impossible.

学校教育心理学的主要研究方法有__________、__________、教育经验总结法、自然实验法、实验室实验法和__________。

临床使用源轴距技术照射时，常使用_________概念。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

提出电子自旋概念的主要实验事实是_______和___________。