临床医学研究中的保密原则（） A.欺骗、威胁、利诱进行医学临床实验违反了道德和法律

前列腺液检查见到白细胞、前列腺颗粒细胞明显增多、红细胞轻度增高，卵磷脂小体消失，最可能的诊断是（）

A.前列腺癌

B.前列腺结石

C.前列腺结核

D.前列腺炎

E.精囊炎

为何要强化军队战斗精神？

A microscope is a useful instrument for observing small objects. By producing a bigger image, the microscope reveals details that are undetectable to the naked eye(裸眼).

Before using the microscope, please read the instructions below.

CAUTION: Microscopes are both delicate and expensive and must be handled with care.

1. Always carry the microscope with two hands — one supporting the base and the other on the arm.

2. Avoid stretching the wire of the lamp across a walkway.

3. Keep the stage clean and always use a glass slide for specimens(样本).

4. To avoid crushing the glass slide when focusing, begin with the lens close to the specimen and gradually back off to focus.

5. Keep the microscope covered to prevent the dust while it is being stored.

HOW TO USE THE MICROSCOPE:

1. Plug(接通电源) in the lamp.

2. Place a sample of what you wish to observe on a slide.

3. Adjust the mirror so it reflects light from the room up into the objective lens. When the mirror is correctly adjusted, a complete circle of light iwll appear when you look through the eyepiece.

4. Place your slide with the specimen directly over the center of the glass circle on teh stage. If it is a wet slide, be sure the bottom of the slide is dry.

5. With the LOW POWER objective leans placed over the slide, use the coarse focus knob to lower the lens to the lowest point.

6. Look through the eyepiece with one eye while closing the other eye. Slowly raise the lens until teh focus is relatively clear.

7. Use the fine focus knob to fine -tune(微调)the focus.

8. Without changing the focus knobs, switch to the HIGH POWER objective lens. Once you have switched to HIGH POWER, use only the fine focus knob to make the image sharper.

小题1:Which of the following is the correct way to use a microscope according to the text?

A．Use one hand to carry the microscope

B．Place a sample directly on the clean stage

C．When stored, the microscope should be adjusted.

D．Look through the eyepiece with one eye.小题2:If you want to observe a thin piece of hair, which of the following should you do first.?

A．Switch to objective lens.

B．Adjust the mirror.

C．Look through the eyepiece.

D．Place the hair on a glass slide.小题3:According to the text, you could see a complete circle of light _____.

A．after correctly adjusting the mirror

B．while looking at the specimen on a glass slide

C．after slowly raising the objective lens

D．before positioning the mirror correctly

港口与航道工程常用的土工织物种类有()。

A.编织土工布

B.聚丙烯纤维网

C.机织土工布

D.复合土工布

E.非织造(无纺)土工布

1820—1939年间广东沿海某乡居民离乡谋生情况统计表

时期	乡民迁出总人数	迁至他乡种田人数	迁至城镇做工 或经营小商业人数	出国从事工商业人数
1820—1849	29	29	0	0
1850—1879	72	15	49	8
1880—1911	156	0	118	38
1912—1939	473	0	77	396

①百余年间，该乡居民迁居方向由农村到城镇、国外。

②导致乡民迁居谋生的原因是中国被打开国门，自然经济解体

③导致乡民职业变化的主要原因是人们思想观念的变化，近代经济的兴起。

④第四个时期出国谋生的人数激增，主要原因是国内社会长期动乱，晚清政府压制工商业的发展，日本帝国主义入侵。

以上分析正确的是

A．①②③      B．②③④      C．①②④      D．①③④