关于ag氢气和bg氦气的下列说法正确的是 A.同温、同压下,氢气与氦气的体积比为

题型:选择题

问题:

关于ag氢气和bg氦气的下列说法正确的是     

A.同温、同压下,氢气与氦气的体积比为a:2b

B.同温、同压下,若a=b,则氢气与氦气的物质的量之比为2:1

C.体积相同时,氢气的质量一定小于氦气的质量

D.同温同压下,若两者的体积相等,则其原子数也相等

考点:阿伏加德罗定律
题型:选择题

下列关于脊柱肿瘤描述错误的是()

A.室管膜瘤是成人最常见的脊髓肿瘤

B.星形细胞瘤是儿童最常见的脊髓肿瘤

C.脂肪瘤是椎管内最常见的髓外肿瘤

D.血管瘤是最常见的椎体良性肿瘤

E.转移瘤是最常见的椎体恶性肿瘤

题型:选择题

阅读理解。

     Our house was directly across the street from the clinic entrance of John Hopkins Hospital in Baltimore.

We lived downstairs and rented the upstairs rooms to out-patients at the clinic.

     One summer evening as I was fixing supper, there was a knock at the door. I opened it to see a truly

awful looking man-no taller than my eight-year-old son-I thought as I stared at the shriveled (皱缩的) body.

But the shocking thing was his face-twisted from swelling.

     He told me he'd been hunting for a room since noon but with no success." I guess it's my face…, but my

doctor says with a few more treatments …"

     I told him we would find him a bed. When I had finished the dishes, he told me he fished for a living to

support his daughter, her five children, and her husband, who was hopelessly disabled from a back injury.

He didn't tell it by way of complaint; in fact, every other sentence began with a thanks to God for a blessing.

He was grateful that no pain accompanied his disease, which was apparently a form of skin cancer.

      The next morning before he left for his bus, he asked if he could come back and stay the next time he

had a treatment. I told him he was welcome to come again.

     In the years he came to stay overnight with us, there was never a time that he did not bring us fish or

oysters or vegetables from his garden.

     When I received these little gifts, I often thought of a comment our next-door neighbor made after he left

that first morning." Did you keep that awful looking man last night? I turned him away. You can lose roomers

by accommodating such people!"

     Maybe we did lose roomers once or twice. But oh! If only they could have known him, perhaps their

illnesses would have been easier to bear. I know our family always will be grateful to have known him; from

him we learned what it was to accept the bad without complaint and the good with gratitude.

1. The first time I met the man, _____.

A. I felt pity for his look

B. he frightened my kid

C. he was in need of something to eat

D. he was looking for a place to stay overnight

2. The next-door neighbor refused the man because _____.

A. he might lose roomers

B. the man was poor

C. he had no spare room

D. the man didn't bring him gifts

3. Which of the following is NOT true about the man?

A. He developed skin cancer.

B. He fished to support a large family.

C. God helped him to get over his disease.

D. He didn't complain about his sufferings.

4. What attitude did the man have toward life?

A. Grateful.

B. Confident.

C. Regretful.

D. Passive.

5. What might be the best title of the passage?

A. Never judge a book by its cover

B. Give others a hand

C. Be the architect of life

D. Accept good and bad with gratitude

题型:选择题

企业在生产经营过程中发生的各项期间费用,不记入产品制造成本,直接记入当期损益。()

题型:选择题

2012年5月,叙利亚爆发了人道主义危机,西方国家要求制裁叙利亚,而中国则反对干涉叙利亚内政。这体现了中国政府处理国际关系的基本准则是

A.利益第一的原则

B.和平共处五项原则

C.大国强权的原则

D.“ * * 高于主权”原则

题型:选择题

已知A、B、C、D、E是短周期中原子序数依次增大的5种主族元素,其中元素A、E的单质在常温下呈气态,元素B的原子最外层电子数是其电子层数的2倍,元素C在同周期的主族元素中原子半径最大,元素D的合金是日常生活中常用的金属材料.下列说法不正确的是  [ ]

A.元素A、B组成的化合物常温下一定呈气态

B.一定条件下,元素C、D的最高价氧化物对应的水化物之间能发生反应

C.工业上常用电解法制备元素C、D、E的单质

D.化合物AE与CE含有相同类型的化学键

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