氨在空气中浓度达到一定范围可燃爆。

题型:判断题

问题:

氨在空气中浓度达到一定范围可燃爆。

考点:船舶机工考试高级船舶机工考试高级船舶机工考试题库
题型:判断题

《中学生守则》规定中学生不准吸烟,这是因为吸烟有害身体健康,吸烟会吸入有毒害的物质是(  )

A.甲醛

B.黄曲霉素

C.二氧化碳

D.一氧化碳

题型:判断题

男,15岁,发热、腹部不适、疲乏、恶心、胃纳减退、尿色变黄5天,体检发现巩膜轻度黄染,肝肋下1cm可扪及,质软,无明显触痛。周围血液RBC 4.2×1012/L,WBC 8.5×109/L,Hb 140g/L,血清谷丙转氨酶460U/L,总胆红素58μmol/L。本例的诊断最可能是()

A.急性食物中毒

B.钩体病

C.急性血管内溶血

D.病毒性肝炎

E.败血症

题型:判断题

用所给词的适当形式填空。

1. This kind of dictionary is very _______ (use).

2. Vitamins are essential (必需的) for healthy _______ (grow).

3. I would rather _______ (wear) green than red. Red is a girl's color.

4. You'll _______ (give) a nice present for your help.

5. I don't like fishing. I'm an ________ (patient) boy.

6. He is the chairperson of the ________ (student) Union.

7. Lily found a golden ring ________ (lie) on the ground.

8. The man said he ________ (prefer) to use yellow to remind him of a warm sunny day.

9. This pen is ________ (value) of all my stationery.

10. The students ________ (divide) into four teams already.

11. Don't make so much ________ (noisy). Your mother is asleep.

12. He is a boring man. He doesn't know how to make life ________ (colour).

13. Our teacher is helpful enough to offer us lots of useful ________ (suggest).

14. _______ (plan) ahead can help you make work easier.

15. The teacher told us time _______ (wait) for no man.

题型:判断题

采煤机电缆夹的长度应为采煤机运行长度的()或略长一些(约长2~4米)。

A.全部

B.一半

C.三分之二

D.四分之三

题型:判断题

某学生兴趣小组为“探究环境因素对光合作用强度的影响”,设计实验如下:

步骤一:取烧杯若干,平均分为五组,分别编号为组1至组5;

步骤二:将各组烧杯按照下表的实验设计进行设置;

步骤三:制备生长旺盛的小圆叶片若干,抽出叶片的气体,使之能沉入水底;

步骤四:将上述小圆叶片等量置于各烧杯中进行实验。

实验结果如下表所示:

根据上述实验回答下列问题:

组5没有叶圆片上浮的原因最可能是()

A.温度过低,光合作用较弱,因而没有氧气释放

B.光照强度较低,光合作用较弱,因而没有氧气释放

C.溶液中无NaHCO3,光合作用较弱,因而没有氧气释放

D.溶液中无NaHCO3,叶肉细胞无法存活,因而没有氧气释放

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