下列叙述中,不正确的是( ) A.天然药物无毒副作用,适合任何人群服用 B.置换反

题型:选择题

问题:

下列叙述中,不正确的是(   )
A.天然药物无毒副作用,适合任何人群服用
B.置换反应都属于氧化还原反应
C.氡()原子核中含有136个中子
D.AgI胶体的分散质粒子直径在1nm~100nm之间
考点:正确使用药物氧化还原反应的本质和特征氧化还原反应的定义胶体原子核的组成及组成粒子间的关系
题型:选择题

Once there was an old man in a town. He always forgot a lot of things. So his wife always had to say to him, "Don’t forget this ! "

One day he went on a long trip alone. Before he left home, his wife said, "Now you have all these things. They are what you need for your trip. Take care of your things during the trip." He went to the station, bought a ticket and got on the train with it.

About half an hour later, the conductor began to see the tickets. He came to the old man and said, "Will you please show me your ticket?" The old man looked for his ticket in all his pockets, but he could not find it. He was very worried. “I can’t find my ticket. I really bought a ticket before I got on the train." said the old man.

“I believe you bought a ticket. All right, you don’t have to buy another one," said the conductor kindly. "But how can I know where I’m going? ---I can’t remember my station!" the old man said sadly.

小题1:Where is the ticket?_______.

A.The old man forgot to buy it.

B.The old man could not remember where it was.

C.The old man showed it to the conductor.

D.The old man’s wife took the ticket away.小题2:The old man was sad because_______.

A.he had to buy another ticket.

B.he lost all the things his wife gave him.

C.he did not know where he was.

D.he did not know where he should get off.

题型:选择题

下列说法中正确的是(  )

A.有加速度的物体速度一定增加

B.没有加速度的物体速度一定不变

C.物体的速度有变化,加速度可以为零

D.加速度为零,则速度也为零

题型:选择题

低碳经济是人类文明进步的新进程。

题型:选择题

生油层可以是海相的,也可以是()相的沉积地层。

A、陆

B、湖

C、深海

D、河流

题型:选择题

耐压试验的主要目的是检验容器受压部件的结构强度,验证其是否具有在设计压力下安全运行所需的承载能力。

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