题干

某同学完成了以下关于酶特性的实验操作:取两支试管并编号1,2,各注入2mL3%H2O2溶液;向1号管内滴入2滴氯化铁溶液,2号管内滴入2滴肝脏研磨液;堵住试管口,轻轻振荡两试管,观察并用带余星的木条检验,记录结果.
上一题 下一题 0.0难度 选择题 更新时间:2019-11-06 02:26:09

答案(点此获取答案解析)

同类题2

阅读理解

    International travelers, whether traveling for business or pleasure, will find themselves solo from time to time. Here are a few ways to meet new people and perhaps even get new travel chances.

    Make yourself friendly

    Be relaxed and polite. Remember to put yourself in social activities. Restaurants, shops and parks are all great places to meet people. If you want to make local friends in a country, stay near the place the locals often visit.

    Show your photo album(影集)

    Keep a small photo album in your bag when you travel. Photos of family, friends and pets will help your new friends learn more about you and give you things to talk about. They will share their own stories with you, and it will help you learn more about your new friends.

    Share something special

    Can you help your new friends improve their Chinese? Can you cook a traditional Chinese meal? By sharing your skills, you can have a close friendship with your new friends that they won't soon forget.

    Give some gifts

    Many foreigners love Chinese goods but have to pay a lot when buying them in their homeland, so you'd better prepare some gifts such as silks, tea and works of art. They are always popular.

    Exchange flats

    If you and your new friends get along well, you can give them your information and plan to exchange flats for your next trip. Then you can visit their countries and stay in their houses while they stay in yours. In this way you will improve your friendship and live like a local abroad, but pay less for traveling.