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问题 单项选择题

钢筋和混凝土两种材料能有效结合在一起共同工作，下列何种说法不正确（）。

A.钢筋与混凝土之间有可靠的黏结强度 

B.钢筋与混凝土两种材料的温度线膨胀系数相近 

C.钢筋与混凝土都有较高的抗拉强度 

D.混凝土对钢筋具有良好的保护作用

答案

参考答案：C

解析：

钢筋具有较高的抗拉强度，对混凝土材料而言，其抗拉强度只有抗压拉强度的约1/10，钢筋与混凝土两种材料的结合正是利用钢筋抗拉强度较高的优势，弥补混凝土抗拉强度低的缺陷。

单项选择题

There are about 75 brands of microwave popcorn on the market; altogether, they account for a little over half of the money from sales of microwave food products. It takes three minutes to pop corn in the microwave, compared to seven minutes to pop corn conventionally. Yet by weight, microwave popcorn typically costs over five times as much as conventional popcorn. Judging by the popularity of microwave popcorn, many people are willing to pay a high price for just a little additional convenience.
If the statements in the passage are true, which one of the following must also be true

A．No single brand of microwave popcorn accounts for a large share of microwave food product sales.

B．There are more brands of microwave popcorn on the market than there are of any other microwave food product.

C．By volume, more microwave popcorn is sold than is conventional popcorn.

D．More money is spent on microwave food products that take three minutes or less to cook than on microwave food products that take longer to cook.

E．(E) Of the total number of microwave food products on the market, most are microwave popcorn products.
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单项选择题 案例分析题

男，38岁，主因咳嗽、咳白痰，晨起发现痰中带血1次，各种化验未见异常。

透视发现左肺上叶结节样病变，考虑为肺结核，平片发现病灶边缘有毛刺，考虑为肺癌，行HRCT，图像如下，你考虑为何种疾病（）

A.肺结核

B.周围型肺癌

C.肺泡癌

D.中心型肺癌

E.瘢痕癌
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