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、

关节脱位可造成骨内血供中断，晚期出现___________或___________。

直流电压在________以下极少引起伤亡事故，而交流电在________以上即会造成触电危险。

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

Which do you think is _________________important, health or wealth?

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

能影响中断响应次序的技术是中断优先级和______。

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

电机从供电方式分类可以分为 ___ 和___ 两大类。

提高供电电路的功率因数，下列说法正确的是________。