The Development of RubberHere is the story of rubber. From the earliest time it was common knowledge (51) the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid (52) milk came out, and that (53) this a sticky (粘的) mass of rubber might be made. This rubber is soft when warm, so that it is possible to give it any (54) . The Peruvians made the (55) that it was very good for keeping out the wet. Then in the early 1800’s, the Americans made use of it for the first time. First they made overshoes to (56) their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cloth with rubber as Mr. Mackintosh (57) , and our raincoats are still named after him.But these first rubber overshoes and raincoats were all soft and sticky in summer, and (58) and inelastic (无弹性的) in the winter when it was col D. But the rubber we have today is soft and elastic (有弹性的), (59) very strong m even in the warmest summer and the coldest winter. This was made (60) by a man called Goodyear. After many (61) , he found that nitric acid (硝酸) made the rubber much better, but it is not hard and strong enough. Then a strange thing took(62) . A friend of his, Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulfur (硫磺) and put in the sun. Goodyear put this idea (63) the test, and saw that it did have more or less the desired effect though somewhat less than more. The only effect it had was on the outside of the rubber. It is common knowledge now that the (64) to make rubber hard and strong is by heating it with sulfur. It took Goodyear four more years to find this metho D. When at last he did it, he had (65) at all. Everything of the smallest value had been used to get money, even his sons’ school-books. 57()
A. did
B. built
C. tried
D. conducted
2010年位于某市区的化妆品生产企业属于增值税一般纳税人,发生下列经济业务: (1)购入原材料取得增值税专用发票上注明的价款为1000万元; (2)购入电力56万元并取得专用发票,其中12万元用于集体福利方面,其余均用于生产应税产品; (3)销售化妆品实现不含增值税的销售收入2000万元,销售时用自己的车队负责运输,向购买方收取运费51.48万元; (4)提供非应税消费品的加工业务,共开具普通发票60张,金额合计为70.2万元; (5)销售成本共计800万元;营业税金及附加为770万元;销售费用30万元、管理费用20万元、财务费用中的利息支出16万元; (6)支付滞纳金和行政性罚款共计10万元,支付购货合同违约金6万元。取得的增值税专用发票已通过认证,化妆品的消费税税率为30%。 要求: (1)计算本企业当年应该缴纳的增值税。 (2)计算本企业当年应该缴纳的消费税。 (3)计算本企业当年应该缴纳的企业所得税。
多为溶血性链球菌
A. 血标本增菌培养呈现浑浊并有凝块
B. 血标本增菌培养呈现均匀浑浊,发酵葡萄糖产气
C. 血标本增菌培养呈现微浑浊,有绿色变化
D. 血标本增菌培养表面有菌膜,膜下见绿色浑浊
E. 血标本增菌培养血液层上面有颗粒生长,自上而下的溶血
Oceanography Oceanography has been defined as "the application of all sciences to the study of the sea. " Before the nineteenth century, scientists with an interest in the sea were few. Certainly Newton considered some theoretical aspects of it in his writings, but he was reluctant to go to sea to farther his work. For most people the sea was remote, and with the exception of early intercontinental (大陆间的 ) travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone to ask what lay beneath the surface. The first time that the question-" what is at the bottom of the oceans" had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed. The engineers had to know the depth profile(起伏形状)of the route to estimate the length of cable that had to be manufactured. It was to Maury of the LIS Navy that the Atlantic Telegraph Company turned, in 1853, for information on this matter. In the 1840s, Maury had been responsible for encouraging voyages during which soundings(测水深) were taken to investigate the depths of the North Atlantic and Pacific Oceans. Later, some of his findings aroused much. popular interest in his book "The Physical Geography of the Sea". The cable was laid, but not until 1866 was the connection made permanent and reliable. At the early attempts, the cable failed and when it was taken out for repairing it was found to be covered with living creatures, a fact which defied contemporary scientific opinion that there was no life in the deeper parts of the sea. Within a few years oceanography was under way. In 1872, Thomson led a scientific expedition (考察), which lasted for four years and brought home thousands of samples from the sea. Their classification and analysis occupied scientists for years and led to a five-volume report, the last volume being published in 1895. "defied" in the paragraph 5 probably means______.
A. doubted
B. challenged
C. gave proof to
D. agreed to