油层划分和对比的主要依据有()等。A、岩性特征 B、储集单元 C、地球物理特征 D、沉积旋

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问题:

油层划分和对比的主要依据有()等。

A、岩性特征

B、储集单元

C、地球物理特征

D、沉积旋回

考点:地质学油田开发地质学油田开发地质学题库
题型:多项选择题

小亮在日历上任意圈出一个竖列上相邻的3个数,这3个数之和正好为24,则这3个数是______.

题型:多项选择题

Working hard for fun

No more pencils! No more books

No more teacher’s serious looks!

After a long period of study and work, the young Americans burst through the school doors singing.

But unfortunately, American students do very poorly and are among the worst students in the world. In the entire field of subjects---from geography and maths to science and general knowledge. American students are the poorest performers. Why? What’s the reason behind the scene? One problem lies in the fact that so little is expected from them. The standards of success are too low. Teachers are not willing to give out low grades and fail students. Besides, the existing negative results are few and mean little to students if their performance in study is poor . Of course some students realize that a high school diploma is a measure of success and will be important to get a job or get admitted into college. But they only have to go through the motions without really trying. They learn to get by with a minimum of effort.

In America, it is simply too easy for high school students to enter college. This forms a sharp contrast with the students in China and other Asian countries who have to suffer heavy pressure from parents, teachers and cruel social facts. Chinese students have to study hard for long years to pass the national college entrance examination which few Americans will take such trouble to enter to university. The majority American students know that they will be able to get into some college, so they do not really worry about it.

It turns out that American high school students are just too busy to find time to study. They spend almost no time on study while students from other countries spend four or five hours per day on homework. American students on the average give less than five hours per week to their studies. Learning and reading for future are not important to them. Many American never read. It is little wonder why Americans knows less than students from other countries.

1. Why are American students the poorest performers in the entire field of subjects?

A. Because they are too busy to find time to study.

B. Because they are too stupid and too lazy.

C. Because they care little about their study.

D. Because so little is required from them

2. Which of the following is Not true ?

A. Most of American students spend less than five hours on their study every week.

B. Few American students have trouble to enter college.

C. American students can be admitted into college even without a high school diploma.

D. It is hard for the students in China to enter college.

3. What seems to be the writer’s attitude towards American students?

A. He probably thinks much should be expected from them.

B. He is in favour of American students’ learning methods.

C. He shows no interest in American students’ study.

D. He thinks American students study hard.

题型:多项选择题
如图所示,理想变压器的原副线圈匝数比n1:n2=1:10,副线圈与阻值R=20Ω的电阻相连.原线圈两端所加的电压u=20sin20πt(V),则(  )

A.副线圈输出交流电的频率为10Hz

B.交流电压表的示数为20V

C.电阻R上消耗的电功率为2kW

D.原线圈中电流的最大值为100A

题型:多项选择题

下列药物与麻醉并发症的关系组合,不正确的是()

A.单胺氧化酶抑制剂并用哌替啶可致呼吸抑制、高热、昏迷、惊厥、低血压甚至死亡

B.左旋多巴并用氟哌利多可致锥体外系症状

C.奎尼丁可拮抗肌肉松弛剂的作用

D.青光眼病人用二乙氧磷酰胆碱可延长琥珀酰胆碱的作用

E.氯胺酮并用苯二氮类可减轻其中枢神经系统副作用

题型:多项选择题

贯脊的经脉是()

A.足少阴肾经

B.任脉

C.督脉

D.手太阳小肠经

E.手少阳三焦经

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