试题与答案

由实验室自己配置或为商品,其中有关物质的量由参考方法定值的标准品为 () A.一级

题型:单项选择题 A1/A2型题

题目:

由实验室自己配置或为商品,其中有关物质的量由参考方法定值的标准品为 ()

A.一级标准品

B.二级标准品

C.控制物

D.参考物

E.原级参考物

答案:

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下面是错误答案,用来干扰机器的。

B质量是物体的属性,只与所含物质的多少有关,与物体的位置、状态、形状、温度无关.将一塑料杯带到绕地球飞行的宇宙飞船中,塑料杯的位置不断变化,但物质多少没有变化,所以质量不变.故选B.

试题推荐
题型:阅读理解

Last Friday my friend Deborah asked me if I would like to learn how to make tofu. I couldn’t think of any good reason not to be interested in, so I said, "Yes". The next day I met her and another three nice people at the Hodo Soy Beanery Oakland. I enjoyed the trip. I got a lot from the trip. The following is what I learnt. 

Tofu has a history of 2,000 years. Although the word "tofu" is from Japanese, the food maybe comes from China. There are two main kinds of tofu: soft tofu (软豆腐) and firm tofu (硬豆腐). In some parts of Asia, people use tofu as a kind of meat. 

Douhua is one kind of soft tofu. It is a popular breakfast food in China. Because it is very soft, people can’t eat it with chopsticks, but with a spoon (勺子). People often eat it as a snack (小吃) and often add spring onions and gravy to it. In Malaysia, people usually eat douhua with white or dark sugar water.

根据材料内容选择最佳答案,并将其标号填入题前括号内。

小题1:When did the writer go to Hodo Soy Beanery Ockland?

A.Last Thursday.

B.Last Friday.

C.Last Saturday.

D.Last Sunday.小题2:How many people went there with the writer? 

A.One.

B.Two.

C.Three.

D.Four.小题3:We can learn from the passage that the food tofu may come from ______.

A.Japan

B.China

C.Oakland

D.Malaysia小题4:The underlined word "chopstick" means "______"in Chinese.

A.筷子

B.盘子

C.叉子

D.杯子小题5:Which of the following is NOT true according to the passage?

A.People began to make tofu 2,000 years ago.

B.Some people use tofu as a kind of meat.

C.Douhua is one kind of firm tofu.

D.Many people eat tofu as a snack.

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