下列不是血小板聚集诱导剂的是 （） A.ADP B.ATP C.凝血酶 D.胶原

用实验室提供的常器材（电源是一节干电池）测电阻时，小明与另外三位同学各自设计了如图甲、乙、丙、丁四个电路图。

（1）小明连接好电路后，闭合开关S，移动滑动变阻器的滑片P，测得数据如下：

电压表示数U/V	0.6	0.8	1.0	1.2	1.4
电流表示数I/A	0.18	0.24	0.30	0.36	0.42

    请你通过分析表格中的实验数据，推断小明在实验中所用的电路是    图。

（2）另外三位同学连接好电路后，闭合开关S，移动变阻器的滑片P时，分别出现了下 * * 种异常现象；

（A）电流表示数有变化，电压表示数几乎为零

（B）电流表示数几乎为零，电压表示数基本不变

（C）电流表烧杯

请你判断：按           图连接的电路出现现象（A）；按       图连接的电路出现现象（B）；按           图连接的电路出现现象（C）。

（3）分析表中数据得到什么结论                                                                                                                         

3分=______秒　2吨=______千克　50毫米=______厘米．

2005年3月2日，A公司与B公司签订了一份标的额为60万元的货物买卖合同。该合同约定：A公司于3月3日向B公司签发一张金额为人民币15万元的银行承兑汇票作为定金；B公司于3月10日交付货物；A公司于B公司交付货物之日起3日内付清贷款；任何一方违约，应当依照合同金额的20%向守约方支付违约金。
3月3日，A公司依约向B公司签发并交付了一张由C银行承兑和付款的金额为15万元的银行承兑汇票，B公司在收到该汇票后，于3月4日将其背书转让给D公司。
3月10日，B公司未能按期向A公司交付设备，经A公司催告后至3月15日，B公司仍未交货。A公司遂于3月18日另行购买了所需的货物，并通知B公司解除合同，要求B公司双倍返还定金30万元，同时支付违约金20万元。D公司收到A公司通知后未就解除合同提出异议，但不同意A公司提出的双倍返还定金和支付违约金的要求。
3月9日，D公司取得的上述汇票不慎被盗，同日，D公司到C银行办理了挂失止付手续。3月10日，王某用盗得的上述汇票以D公司的名义向正商场购买电器，并以D公司的名义将该汇票作为支付的价款。3月12日，E商场为支付F公司货款，又将该汇票背书转让给F公司。4月5日，F公司在该汇票到期日向C银行提示付款，C银行以汇票已挂失止付为由拒绝支付票款。
要求：根据上述事实，回答下列问题：
(1)双方约定的定金有什么不妥之处说明理由。
(2)B公司收到A公司解除合同通知后，双方之间签订的买卖合同是否已经解除说明理由。
(3)A公司要求B公司双倍返还定金30万元，同时支付违约金20万元是否符合《合同法》的规定说明理由。
(4)王某以D公司的名义将汇票签章背书转让给E公司的行为是否有效并说明理由。
(5)C银行是否可以以挂失止付为由拒绝付款说明理由。

新事业发展的六天原则是什么？

Another critical factor that plays a part in susceptibility to colds is age. A study done by the University of Michigan School of Public Health revealed particulars that seem to hold true for the general population. Infants are the most cold-ridden group, averaging more than six colds in their first year. Boys have more colds than girls up to age three. After the age of three, girls are more susceptible than boys, and teenage girls average three colds a year to boys’ two.
The general incidence of colds continues to decline into maturity. Elderly people who are in good health have as few as one or two colds annually. One exception is found among people in their twenties, especially women, who show a rise in cold infections, because people in this age group are most likely to have young children. Adults who delay having children until their thirties and forties experience the same sudden increase in cold infections.
The study also found that economics plays an important role. As income increases, the frequency at which colds are reported in the family decreases. Families with the lowest income suffer about a third more colds than families at the upper end. Lower income generally forces people to live in more cramped quarters than those typically occupied by wealthier people, and crowding increases the opportunities for the cold virus to travel from person to person. Low income may also adversely influence diet. The degree to which poor nutrition affects susceptibility to colds is not yet clearly established, but an inadequate diet is suspected of lowering resistance generally.

The phrase "people in this age group" underlined in Paragraph 2 refers to ______ .

A．infants



B．people in their twenties
C．people in their thirties and forties
D．elderly people