临床检验各项报告如何将惯用单位改为国际单位（SI）制？

One of China’s most popular folk arts is paper cutting（剪纸）. Archaeological(考古学的) finds trace the tradition back to the 6^th century; it is supposed that the beginnings of paper cutting were even a few centuries earlier. Paper cuttings are used for religious(宗教的) purposes, for decoration (装饰)and as patterns(图案).

Today, paper cuttings are mainly used as decoration. They ornament walls, windows, doors, columns mirrors, lamps and lanterns in homes. They are also used for decoration on presents, and are given as presents themselves. They are of special importance at festivals. At the Spring Festival for example, entrances are decorated with paper cuttings which are supposed to bring good luck.

Paper cuttings are not produced by machine, but by hand. There are two kinds of paper cuttings; scissor (剪刀) cuttings and knife cuttings. Scissor cuttings are fashioned with scissors. Several pieces of paper--- up to eight pieces---are fastened together. The motif(图形) is then cut with sharp, pointed scissors.

Knife cuttings are fashioned by putting several layers (层) of paper on a relatively soft foundation consisting of a mixture of tallow (动物脂) and ashes. Following a pattern, the artist cuts the motif into the paper with a sharp knife which he usually holds vertically(垂直地). The advantage of knife cuttings is that considerably more paper cuttings can be made in one operation than scissor cuttings.

In the countryside, paper cuttings are usually made only by women and girls. This used to be one of the skills that every girl was to master and that were often used to judge brides(新娘). Professional paper cutting artists are, on the other hand, almost always men who have guaranteed (保证) incomes and work together in workshops.

小题1:Paper cuttings can be used for ______________.

A．decoration

B．decoration on presents

C． presents

D．all of the above小题2:The underlined word ornament means ______________.

A．to be added to and make something beautiful

B．to be used as

C．to be cut in

D．to be made on小题3:Which is the best title of this passage?

A．The ways of paper cutting

B．The reasons for paper cutting

C．The purposes of paper cutting

D．Paper cutting

如图所示，小车沿水平地面做直线运动，车箱内悬挂在车顶上的小球悬线与竖直方向夹角为θ，放在车箱底板上的物体A跟车箱相对静止，A的质量为m，A受的摩擦力的大小和方向是（　　）

A．mgsinθ  向右

B．mgtanθ  向右

C．mgsinθ  向左

D．mgtanθ  向左

某建设工程项目承包合同的计价方式是单价合同，地基与基础分部工程完成后，其钢筋混凝土工程实际完成的工程量是2 000m³，而投标时工程量清单中该分项的工程量是1 800m³。

关于单价合同的说法正确的是（）。

A．单价合同适用于施工任务和范围比较明确，业主目标、要求和条件清楚的项目

B．单价合同需对工程范围做出完整的、详定的规定，招标准备时间长

C．业主风险较小，承包商的风险较大，有利于业主控制投资

D．业主和承包商都不存在工程量方面的风险，但对业主投资控制不利

消费者李某在购物中心购买了一台音响设备，依法经有关行政部门认定为不合格商品，李某找到购物中心要求退货。下列何种处理方法是正确的

A．该购物中心认为可以通过更换使李某得到合格产品，因而拒绝退货

B．该购物中心认为该产品经过修理能达到合格，因而拒绝退货

C．该购物中心应按照消费者的要求无条件负责退货

D．该购物中心可以依法选择修理、更换、退货中的任一方式

UARFCN定标值为（）

A.N=5*F

B.N=6*F

C.N=2*F

D.N=7*F