问题
填空题
Meselson-Stahl的DNA半保留复制证实试验中，区别不同DNA用（）方法。分离不同DNA用（）方法，测定DNA含量用（）方法。
答案
参考答案：同位素示踪、超速离心、紫外分光光度
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Meselson-Stahl的DNA半保留复制证实试验中，区别不同DNA用（）方法。分离不同DNA用（）方法，测定DNA含量用（）方法。
参考答案：同位素示踪、超速离心、紫外分光光度
Dr.Jack Todd is very interested in clean water .__小题1:_,so it's natural that he is to developer of a small and affordable system(系统）to clean waste water, His “Living Machine" can clean wastewater in your home or in your business. __小题2:_ The wastewater goes into a big plastic tank where bacteria(细菌）start to break down the waste.A few days later after it is dealt with, the water is brought into a greenhouse filled with plants and fish.With the help of sunlight, the plants and animals remove more chemicals from the water,making it cleaner,Then the water can be reused for washing or bathing _小题3:__ but the water is clean enough for watering the flowing, washing the dog, or even for bathing or swimming. The advantage of this technology is that it is affordable and good for the environment. __小题4:__. It can help to use less fresh water, and it can help keep the water supply unpolluted.
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