标准节流装置前应有（）倍管径长的直管段A、3 B、5 C、7 D、10

甲企业花费1000万元购买一批钢材欲用于某工程，由于某种原因该工程推迟开工三个月。三个月后，由于钢材价格大涨，若在此时购买相同数量的钢材需要花费1500万元。由于该企业疏于仓储管理，导致一部分钢材出现不同程度的锈蚀现象，若此时卖出，可以卖1200万元。在工程开工后，甲企业将该批钢材用在了工程上。如上所述，这批钢材的机会成本是( )。

A．1000万元

B．1200万元

C．1500万元

D．500万元

阅读理解

     My brotherinlaw opened the drawer of my sister's cupboard and took out a package.He said, "This is

a new silk slip (衬裙). Jane bought it in New York nine years ago.She never wore it.She was saving it for a special occasion.I guess this is the occasion."

     It was an exquisite (精美的) handmade silk slip.The price tag on it was still attached.

     He took the slip from me and put it on the bed, with the other clothes we were taking to the mortician (殡仪员). His hands lingered on the soft material for a moment, and then he shut the drawer and turned

to me, "Don't ever save anything for a special occasion.Every day you're alive is a special occasion."

     His words have changed my mind.I'm spending more time with my family and less time on meetings.

I'm trying to recognize these moments now and cherish them.I'm not saving anything.I wear my good skirt

to the market if I feel like it.I can pay $28.49 for a small bag of groceries.I'm not saving my good perfume

for special parties.If something is worth seeing, hearing or doing, I want to see, hear and do it now.

"Someday"_has_disappeared in_my vocabulary.

     I'm not sure what Jane would have done if she had known she'd not be here for the tomorrow.I'm

guessing Jane would have called family members and a few close friends.She might have apologized to

her former friends for their past quarrels.She'd have gone out for a Chinese dinner, her favorite food.

     I'm trying hard not to put off, hold back, or save anything that would add laughter to our lives.Every

morning I open my eyes, I tell myself that every day, every minute, every breath is a gift.

1. Why didn't Jane wear the new silk slip?

A. She meant to wear it on her death.

B. She wanted to save it for her sister.

C. She thought it was too dear.

D. She saved it for a special occasion.

2. After Jane's death, the author begins to________.

A. treasure the simple pleasure of life

B. spend more time having meetings

C. save more money for necessities

D. care about her special parties

3. What does the underlined sentence "'Someday' has disappeared in my vocabulary."

     (in paragraph 4) mean?

A. I prefer to leave out the word "someday" in my speech.

B. "Someday" is found missing from my old dictionary.

C. I will not delay enjoying the pleasure of life.

D. I decide not to enjoy something good at the moment.

4. It can be inferred from the passage that________.

A. it makes sense to follow our dream

B. we tend to leave good things until the last minute

C. we should take pleasure in our work

D. it is meaningless to save something for the future

某患者55岁，绝经6年， * * 不规则流血1个月收入院。体形肥胖，尿糖（+）。妇科检查：外阴 * * 萎缩不明显，宫体稍大，软，活动良，附件（-）。

最主要的治疗手段为（）

A.化学疗法

B.手术治疗

C.放射疗法

D.中药治疗

E.激素治疗

海洋测绘

原生金刚石矿床的母岩主要是（）。

A、花岗闪长岩和石英二长岩等；

B、金伯利岩；

C、闪长岩、正长岩