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问题 判断题

[渤海银行] 一般来讲，当某种存货数量比重达到70%左右时，可将其划分为A类存货，进行重点管理和控制。( )

答案

参考答案：错

解析：[中人教育精析] 不是存货数量比重达到70%左右，而是金额比重达到70%左右。

填空题

选择括号内合适的词，并用其适当形式填空。

(crowd, nine, beside, pick, knife)

1. We're in the _________ grade now. And we will have a very important exam in June.

2. In Britain people not only use __________ to cut things, but also use them to have meals.

3. —Bob, have you _________ up your things on the floor?

   —Not yet, Mum. I am still busy with my homework.

4. On weekends, the supermarkets are usually _________ with people.

5. —Excuse me, would you tell me where I can buy some shampoo?

    —Sure. _________ the post office, there's a small supermarket.

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填空题

现在请你在实验室中探究氢气的有关性质，并回答下列有关问题：

（1）要“证实氢气的密度比空气小”，这属于氢气的______（填“物理”或“化学”）性质．请设计一种简单的实验方案，简述该方案的操作方法和有关现象：______．

（2）欲点燃氢气，试验“氢气在空气中燃烧”．在点燃氢气以前，必须先检验氢气的______，以防发生______．点燃氢气后，观察到的现象是：纯净的氢气在空气里安静地燃烧，产生______色火焰．如果要检验氢气的燃烧物，应采取的操作方法是______．

（3）写出氢气在空气中燃烧反应的文字表达式______，属于______反应．此反应______（吸收或释放）能量，可见氢气可用来作______．
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