一块冰完全熔化成水,下列说法正确的是( ) A.水质量等于冰地质量 B.由于冰地

题型:选择题

问题:

一块冰完全熔化成水,下列说法正确的是(  )

A.水质量等于冰地质量

B.由于冰地状态改变了,质量可能变大了

C.由于冰的状态改变了,质量一定变小了

D.由于冰里的温度升高了,质量一定变大了

考点:质量及其特性
题型:选择题

第二节:阅读下列材料,从所给的五个选项中,选出符合各小题要求的最佳选项。(共4小题,每小题1分,满分4分)

Molly信箱是一个报刊栏目,主持人Molly回答读者提出的各种问题。第65至68题是四位读者的来信。请从A、B、C、D和E中为每封来信选出最合适的回复,并把答案写在答题纸上,选项中一项是多余选项。

_______65  Dear Molly,

I have a problem. My parents are always talking to me about studying. They want me to study harder so I can go to a good school. I know studying is very important, but my parents put too much pressure on me. How can I explain to my parents that I need some free time?

_______ 66  Dear Molly,

My best friend Tony is a nice young man, but he has a bad habit. He is always late. No matter where he is going to, what he is doing, he is never on time. Once he turned up thirty minutes late for a meeting! What can I do to break him of this bad habit?

_______ 67  Dear Molly,

I have a new roommate named Louis. He is a good friend of mine, but he is driving me crazy because he is very untidy. He leaves his dirty clothes everywhere, and he never makes his bed. I am extremely neat. What can I do?

_______68  Dear Molly, 

My cousin plays computer games a lot and he keeps on talking to me about various games. I don’t have any interest at all, but I find it difficult to stop him without hurting his feelings. Would you kindly give me some advice?

A  Dear xx,

As I see it, you have three choices. You can find a new flat for yourself, make him find a new one, or have a talk with him and see if you could both be a little less extreme in your attitudes towards housekeeping. I would suggest you start with the third.

B  Dear xx,

You could try talking to him about the importance of being on time. If it doesn’t work, one trick you can try is to ask him to set his clock 15 minutes ahead. You could also tell him that something starts 15 minutes or more before it really starts.

C  Dear xx,

This is a common problem for people of your age. Tell your parents how you feel. Let them know you respect them. Maybe you can make a deal with them. For example, ask them for one day off each week to do what you want to do.

D  Dear xx,

Next time when he begins talking, you might interrupt him with a smile, saying “That’s interesting, but I hope you understand this is my time to relax. I need to do some reading now.” He may sense your unwillingness and stop talking.

E  Dear xx,

“Be yourself ” is the best solution. If I were you, I’d tell him to leave me alone. At least tell him, “That was hurtful. Please don’t say things like that to me. I’m a football fan and like watching football games. I can make my own decision.”

题型:选择题

环境卫生学的研究内容是?

题型:选择题

下列癫痫类型脑电图改变不正确的是

A.失神发作为对称性3Hz的棘慢波
B.婴儿痉挛症为弥慢性高波幅不对称慢波,杂以尖波、棘波或多棘波
C.复杂部分性发作常有额、颞区病样放电
D.简单部分性发作常有发作同侧皮质的痫样放电
E.小儿良性癫痫伴中央中颞棘波在慢性睡眠期痫样放电明显增多

题型:选择题

()即根据飞行过程中遇到的突发状况,如地形、气象变化、未知限飞禁飞因素等,局部动态的调整飞行路径或改变动作任务。

A.在线规划

B.飞行中重规划

C.飞行前预规划

题型:选择题

油箱里的油量必须淹没回油管。

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