问题
单项选择题
合成催化剂的活化温度()。
A.愈高愈好
B.应低于合成反应的正常操作温度
C.愈低愈好
D.应高于合成反应的正常操作温度
答案
参考答案:B
合成催化剂的活化温度()。
A.愈高愈好
B.应低于合成反应的正常操作温度
C.愈低愈好
D.应高于合成反应的正常操作温度
参考答案:B
根据短文内容,用方框中所给单词的适当形式填空。每词限用一次。
Drink at ___2____8 glasses of water a day. You may need even more water if you are exercising. Breakfast is the most important meal of the day. You will have more energy after eating breakfast. Eat a light lunch every day. If you don’t have time to go out, take a sandwich in the morning with you for a __3______ lunch. We should eat fruit and vegetables every day. Add a banana to your breakfast, have a salad with lunch, and eat at least one vegetable for ___4____. Try to have dinner at least 3 hours before you go to bed. Your body needs time to digest most of the food before you rest__5____the next 8 hours. |