问题
单项选择题
双级膨胀深冷装置原料气在80%~120%负荷内，随流量的（）。
A.增加，收率降低
B.降低，收率增加
C.增加，收率增加
D.改变，收率不变
答案
参考答案：C
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双级膨胀深冷装置原料气在80%~120%负荷内，随流量的（）。
A.增加，收率降低
B.降低，收率增加
C.增加，收率增加
D.改变，收率不变
参考答案：C
 Everyone wants to have healthy teeth. When you laugh, you will 1 your mouth and show your teeth. The healthier your teeth are, the happier you feel. Why is that? It's 2 your teeth are important in many ways. Take care of them, and they'll help to take care of you. Strong, 3 teeth help you grow. They also help you speak clearly. You can take pate of your teeth by doing like these: Brush your teeth 4 a day, after getting up and before bedtime. And you brush all of your teeth, not just the front ones. Spend some time 5 the teeth along the sides and in the back. Take your time while brushing. Spend at 6 three minutes each time you brush. Be sure your toothbrush is soft. Ask your parents to help you get a new toothbrush 7 three months. Clean between your teeth with dental floss(牙线).I t feels strange when you do it at first, but soon you'll get used to 8 it. Brushing 9 your teeth healthy. You also need to care about what you eat and drink. Eat 10 fruits and vegetables and drink water instead of drinks. Do you want to have white and healthy teeth? Please brush your teeth!
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