化学在生产和日常生活中有广泛的应用。下列说法不正确的是 A.X射线法是研究晶体内

题型:选择题

问题:

化学在生产和日常生活中有广泛的应用。下列说法不正确的是

A.X射线法是研究晶体内部结构的重要方法

B.家中发生天然气泄露时,应立即使用室内电话报警

C.氯气泄露时,应用蘸有肥皂水的湿毛巾捂住口鼻疏散到安全区域

D.漂白粉与洁厕精不能混合使用,否则易产生有毒气体

考点:室内空气污染大气污染、改善大气质量水的净化与处理水体污染、爱护水资源
题型:选择题

图所示伏安法测小灯泡的电阻和电功率的实验中,实际情况是,电压表的内阻很大,但也有分流作用,而我们初中阶段认为,电压表相当于绝缘体,无电流通过.这样便使实验的测量值与真实值间有一定的差异,则测量值R 、P 与真实值R0 、P0相比较有

[ ]

A.R >R0  P>P 

B.R<R0  P<P0

C.R> R0  P<P   

D.R< R0  P>P0

题型:选择题

阅读理解。

     A young woman carrying a three-year-old child got on a bus. The conductor hurried to give her a warm

welcome and then kindly asked the other passengers to make more room for the woman and her child. On

seeing this, people began to talk. "You know this conductor used to be very rude. Now suddenly he has

changed his bad behavior," said a middle-aged man. 

     "Yes, he should be praised and we must write a letter to the company," said a second passenger. "That's

right," another lady said, "I wish a newspaper reporter were here so that more people could learn from this

conductor."

     Just then a gentleman who looked like a teacher turned to the conductor and said, "Excuse me, but can

I know your name, please? Your excellent service must be praised..." 

     Before he could open his mouth, the three-year-old child sitting on the young woman's lap interrupted,

"I know his name. I call him Dad."

1. One passenger suggested writing a letter to the company to _____. [ ]

A. make a demand for more buses

B. thank the conductor for his good service

C. criticize the conductor for his rude behavior

D. invite a newspaper reporter to write about the conductor

2. What was the gentleman? [ ]

A. A teacher.

B. A newspaper reporter.

C. Not known from the story.

D. The conductor's friend from his company.

3. The word "him" in the last paragraph refers to _____. [ ]

A. the gentleman

B. the conductor

C. the middle-aged man

D. the three-year-old child

4. It is clear from the story that the conductor _____. [ ]

A. has changed his attitude towards his work

B. has now been kind and polite to all passengers

C. has not changed his rude behavior to passengers

D. has now been kind and polite to women with children

题型:选择题

轧制Ф12的线材时精轧机()架出成品。

A.16

B.18

C.20

D.22

题型:选择题

对瓷柱式断路器及罐式断路器,每隔()年或必要时应进行本体密封情况检查,清理密封脂,更换本体密封件。

A.6

B.12

C.18

D.24

题型:选择题

下列有关地理知识的表述不正确的是()。

A.“丹霞山世界地质公园”经联合国教科文组织批准为中国首批世界地质公园之一

B.秦始皇为沟通湘江和漓江之间的航运,命人开挖了灵渠

C.“和田玉”是我国四大名玉之一,主要产自新疆

D.我国位于北温带内,属于温带气候

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