在某关于阿司匹林与心肌梗死关系的研究中,按照标准,病例和对照都应排除慢性关节炎和慢性

题型:单项选择题

问题:

在某关于阿司匹林与心肌梗死关系的研究中,按照标准,病例和对照都应排除慢性关节炎和慢性胃溃疡患者,若不排除这两类疾病可以导致的偏倚是()

A.信息偏倚

B.测量偏倚

C.混杂偏倚

D.排除偏倚

E.以上都不对

考点:卫生管理(医学高级)流行病学流行病学题库
题型:单项选择题

下列实验现象和结论不能对应的是

A.甲:放入量筒中的黄豆和芝麻,摇匀后读数变小,说明分子间存在空隙

B.乙:海绵发生形变,说明海绵受到压力的作用

C.丙:通电后电磁铁吸引大头针,说明电磁铁有磁性

D.丁:开关闭合后灯泡发光,说明电路中有电流

题型:单项选择题

任务型阅读,根据短文内容完成下列句子。

Dear Zhang Fan,

      I want to go to China very much. I think I know something about China from your letters, but I know

little about Chinese food. I like hamburgers and Coke very much. I like noodles and French fries, too. My

friends tell me that you eat rice, vegetables and meat every day. Is that right? I don't like rice. What food

and drink can I have in China? Please write to me.    

                                                                                                                                       Yours,       

                                                                                                                                        Robert

1.______ writes this letter.

2. He writes this letter to ______.

3. Robert ______ from China.

4. Robert likes ______ and ______ very much.

5. If he comes to China, he will not eat ______.

题型:单项选择题

新生儿室内湿度应保持在()

A.45%~55%

B.55%~65%

C.65%~70%

D.50%~60%

E.60%~70%

题型:单项选择题

增值税专用发票保管中不需要装订成册的是()

A.专用发票抵扣联

B.认证结果通知书

C.认证结果清单

D.专用发票发票联

题型:单项选择题

哪种病原体不是通过性行为传播的()

A、结核杆菌

B、病毒

C、真菌

D、支原体

E、寄生虫

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