衡量电能质量的指标主要是电压、______和波形。

Many boys enjoy _______ football, basketball or baseball

地铁轨道与地面铁路轨道基本相似，我国采用标准轨距________mm，以使与铁路相互配合，更好利用我国铁路的技术、设备。

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．

Which do you think is _________________important, health or wealth?

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

______是研究药物制剂工业生产的基本理论、工艺技术、生产设备和质量管理的科学，也是药剂学重要的分支学科

生存质量评定是___________评定的重要指标之一。

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

放射性药物的质量控制是保证病人安全和保证显像质量的重要措施，必须保证放射性药物_____、_____和必要的__________和__________、__________。