问题
单项选择题
研究化学的配伍变化中，不易观察到的情况有
A．变色
B．沉淀
C．产生毒性
D．产气
E．以上均可观察
答案
参考答案：C
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研究化学的配伍变化中，不易观察到的情况有
A．变色
B．沉淀
C．产生毒性
D．产气
E．以上均可观察
参考答案：C
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| It is important to know how and what to pack for your trip. Why would you take sweaters and coats when you are going on a trip to the beach? Take as little as possible but be sure you have all the things you need for your trip. When you begin to pack, ask yourself the following questions: ▲ Where are you going? Many things you need to pack depend on the place you are going to visit. Think about this. ▲ How is the weather? Take proper clothes for the weather. Don't forget to take an umbrella if it often rains there. ▲ How long will you stay? If you are going to stay for a long time, you may need more clothes, and some other important things. ▲ Who will you go with? If you travel by yourself, you may need a book or some music for your trip. If you are going wit your friends, take something you can do together
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