如果要评价某药物预防某病的流行病学效果,应采用哪种研究方法() A.实验流行病学 B

题型:单项选择题

问题:

如果要评价某药物预防某病的流行病学效果,应采用哪种研究方法()

A.实验流行病学

B.现况研究

C.队列研究

D.临床研究

E.专题调查

考点:职业卫生(医学高级)流行病学流行病学题库
题型:单项选择题

Those _________  may leave the classroom now.

A.whohasfinished

B.whohavefinished

C.havefinished

D.whomhavefinished

题型:单项选择题

During our two months on the road, Bennett and I had a really (1) experience with a good, honest (2) and some helpful mechanics.

We were driving east on Highway 10 when our "chick engine" light came on. We limped of a(n) (3) into Las Cruces. We had a real car (4) Bennett nursed the ear into a local garage. By this time the car was missing so (5) it was shaking all over. This was the (6) time to arrive at a garage—late Friday afternoon. Service adviser Scott was busy (7) paper work and customers as we (8) our problems. (9) he was already "ten cars behind", he told us to pull the car into the garage.

Lincoln, who we later (10) was one of the two motor technicians, took (11) of our car repairing. He and Scott and some other mechanics stayed several hours after closing, (12) the car.

Early the next morning (the shop was officially closed on Saturdays), Lincoln finally located the (13) and fixed it easily within only (14)

Later Scott (15) out to us that it was our attitude that helped. "You didn’t come into the place demanding this or that. You showed an (16) of our problems on a busy Friday afternoon. Customer’s attitude means a lot. " He was right in some way, customers should show (17) and understanding to people who (18) them. (19) people were extremely busy, they found way to at least try and help when they are met with politeness.

The pleasant experience I had shows that (20) for other people can always help.

19()

A.Even if 

B.Even as 

C.Even so 

D.Even then

题型:单项选择题

在进行所有轴系中心找正工作中,()不能在凝汽器灌水至运行重量的状态下进行。

A.轴系初找

B.轴系联结时的复找

C.二次灌浆后的复找

D.基础二次灌浆前的复找

题型:单项选择题

混凝土灌注桩的材料质量要求中,预拌混凝土坍落度取70~100mm,水下灌注时取180~200mm,强度等级应在( )之间。

A.C15~C30
B.C20~C40
C.C25~C40
D.C30~C50

题型:单项选择题

有关蛋白同化激素治疗身材矮小的原则哪项是错误的

A.任何年龄都可应用

B.开始治疗时骨龄延迟至少3岁以上

C.定期测量身高,观察疗效

D.切忌药量过大,间隔过短和连续用药

E.定期监测骨龄,避免骨龄过快增长

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