如图,是两列频率相同的相干水面波于某时刻的叠加情况,图中的实线和虚线分别表示波峰

题型:选择题

问题:

如图,是两列频率相同的相干水面波于某时刻的叠加情况,图中的实线和虚线分别表示波峰和波谷,此时( )

A.ab连线中点速度为零
B.ab连线中点振动加强
C.再经过周期,ab两点振动减弱
D.再经过周期,cd两点振动加强
考点:波的干涉波的衍射
题型:选择题

生活中有许多与惯性有关的事例,下列事例与惯性无关的是[ ]

A.熟了的苹果从树上掉下来

B.河里嬉戏的鸭子上岸后用力抖动翅膀,把身上的水抖掉

C.司机开车在高速公路上行驶时必须系安全带

D.锤头松了,把锤柄一端在地上撞击几下就紧了

题型:选择题

具有收敛散风,杀真菌,止痒作用的外用药剂型是

A.油剂
B.溶液
C.粉剂
D.洗剂
E.酊剂

题型:选择题

Questions 14-23


·Look at the ten statements for this part.
·You will hear a passage about "the number of genes ". You will listen to it twice.
·Decide whether you think each statement is right(R), wrong(W) or not mentioned(NM).
·Markyour answers on the Answer Sheet.

The Novartis scientists did a new study and found the number could be forty thousand.

A.Right

B.Wrong

C.Not Mentioned

题型:选择题

在今江苏省无锡市西郊锡惠公园内,有一处著名泉水,相传唐代由陆羽亲鉴,故又名陆子泉,元代书法家赵孟頫曾专为之赋诗题字,清代又曾被乾隆帝御封,是以历代名声不绝,这处泉水被誉为()

A.天下第一泉

B.天下第二泉

C.天下第三泉

D.天下第四泉

题型:选择题

Although Henry Ford’s name is closely associated with the concept of mass production,he should receive equal credit for introducing labor practices as early as 1913 that would be considered advanced even by today’s standards. Safety measures were improved, and the workday was reduced to eight hours, compared with the ten-or-twelve-hour day common at the time. In order to accommodate the shorter work day, the entire factory was converted from two to three shifts.
In addition, sick leaves as well as improved medical care for those injured on the job were instituted. (47)The Ford Motor Company was one of the first factories to develop a technical school to train specialized skilled laborers and an English language school for immigrants. Some efforts were even made to hire the handicapped and provide jobs for former convicts.
(48)The most widely acclaimed innovation was the five-dollar-a-day minimum wage that was offered in order to recruit and retain the best mechanics and to discourage the growth of labor unions. Ford explained the new wage policy in terms of efficiency and profit sharing. He also mentioned the fact that his employees would be able to purchase the automobiles that they produced—in effect creating a market for the product. (49)In order to qualify for the minimum wage, an employee had to establish a decent home and demonstrate good personal habits,including sobriety,thriftiness,industriousness,and dependability. (50)Although some criticism was directed at Ford for involving himself too much in the personal lives of his employees,there can be no doubt that,at a time when immigrants were being taken advantage of in frightful ways,henry Ford was helping many people to establish themselves in America.

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