管段图的绘制一般按（）投影方法制图。A、正等轴测 B、正二轴测 C、斜二轴测 D、不

一个圆柱的底面半径扩大5倍，高不变，它的体积扩大（　　）倍．

A．5

B．10

C．15

D．25

阅读理解。

    For thousands of years, man has enjoyed the taste of apples. Apples, which are about 85 percent water,

grow almost everywhere in the world but the hottest and coldest areas (地区). Among the leading countries

in apple production are China, France and the United States.

    There are various kinds of apples, but a very few make up the majority of those grown for sale. The three

most common kinds grown in the United States are Delicious, golden Delicious, and McIntosh. 　　

     Apples are different in colour, size, and taste. The colour of the skin may be red, green, or yellow. They

have various sizes, with Delicious apples being among the largest. The taste may be sweet or tart (酸的).

Generally, sweet apples are eaten fresh while tart apples are used to make applesauce (苹果酱). 　　

     Apple trees may grow as tall as twelve metres. They do best in areas that have very cold winters. Although

no fruit is yielded during the winter, this cold period is good for the tree.

1. It can be learned from the text that Delicious apples are _____.[ ]

A. grown in France　

B. sold everywhere

C. very big　　　　　　

D. quite sweet

2. Cold winter weather is good for _____.[ ]

A.the growth of apple trees　

B. producing large apples

C. improving the taste of apples　

D. the increase of water in apples

3. China, France and the United States are considered to _____. [ ]

A. be large producers of apples　

B. be large producers of applesauce

C. have the longest history in apple production

D. have the coldest winter among apple producing countries

4. The word yielded in the last sentence means _____.[ ]

A.improved

B. increased　

C.produced

D. sold

言《金匮》"全篇以此病例彼病，为启吾之捷法"的是（）

A.清·尤在泾

B.清·唐容川

C.清·徐大椿

D.清·陈修园

PFC电路的主要作用是（）。

枳实薤白桂枝汤中，具有通阳散寒、降逆平冲作用的药物是（）

A.枳实

B.薤白

C.桂枝

D.厚朴

E.瓜蒌