问题 多项选择题

用标准气对工业色谱仪进行校验后,通入工艺气仪表指示值误差很大,可以采用与实验室对照的方法,确认标准气是否因()等原因致使某些组分发生变化。

A、气瓶内壁未做相应处理

B、气瓶材质选择不当

C、气瓶净化处理不严格

D、气体保存环境温度过低

答案

参考答案:A, B, C

阅读理解

阅读短文,选择正确答案。

    Elephants are interesting animals with large ears, a long trunk, and short legs. They use their legs to stand and

walk. Unlike (不像) lions and tigers, an elephant cannot use its legs to jump or run fast. But elephants do have

something that most animals do not have — a trunk!

    It is difficult for an elephant to bend (弯曲) down to reach food on the ground because of its short, fat legs.

That is why an elephant has a trunk. It uses its trunk to reach food it needs. Without its trunk, an elephant would

be helpless.

    An elephant uses its trunk as a monkey might use its arms and hands. The elephant can scratch (抓) an itch

(痒), pick up a small peanut (坚果) or a piece of popcorn (爆米花), and touch objects with its trunk. An

elephant's trunk can even wrap (裹) around a tree and pull it out of the ground. An elephant's trunk also helps it

drink water. An elephant can drink as much as 50 gallons (加仑) of water into its trunk. Then the elephant

squirts (喷出) the water into its mouth and down its throat (喉咙). An elephant's trunk is very useful!

1. In paragraph 2, helpless means _______. [ ]

A. without help

B. with help

C. trying to help

D. full of help

2. What is one way that the elephant's trunk is like a monkey's hands? [ ]

A. Both have fingers (手指).

B. Both squirt water.

C. Both can hold food.

D. Both have fingernails (指甲).

3. This story mostly tells the reader that elephants ________. [ ]

A. use their short legs to find food

B. are stronger than most animals

C. drink water once a day

D. would be helpless without a trunk

单项选择题 A1型题