3000米=______千米50千米=______米6米=______厘米.

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问题:

3000米=______千米50千米=______米6米=______厘米.
考点:长度单位间的换算
题型:填空题

下列不属于血液成分制品的是()。

A.白蛋白

B.浓缩红细胞

C.冷沉淀

D.血浆代用品

E.新鲜冰冻血浆

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亲代不是把性状直接传给后代,传递的是遗传物质。[ ]

题型:填空题

在一定条件下,反应N2+3H22NH3,在2L密闭容器中进行,5min内氨的质量增加了1.7g,则反应速率为

A.v(H2)=0.03mol/(L·min)

B.v(N2)="0.005mol/(L·min)"

C.v(NH3)=0.17mol/(L·min)

D.v(NH3)=0.02mol/(L·min)

题型:填空题

以下出口单价只有( )是正确的。

A.250美元/桶

B.250美元/通CIF纽约

C.250美元/桶CIF广州

D.250美元/桶CFR德国

题型:填空题

A total of 4.6 million digital televisions have been sold, and the sales of HDTV sets have quadrupled since last year. Consumers have bought HDTVs to play their DVDs and to have clearer pictures and wide screens. Only a small percentage of the people who have purchased HDTVs, however, have actually hooked their TVs up to receive high-definition television digital signals. Perhaps television viewers are having trouble keeping up with the changes in technology. Even the manufacturers of HDTVs, like Mitsubishi, Thomson Multimedia, Sony, and Samsung seem to have a tough time learning how to make their sets work with the various digital TV formats because little standardization has been required or implemented in the industry.

Some of the HDTVs weigh over 200 lbs., and a variety of retailers offer a delivery service to the buyer’s home to help install the heavy sets. This is known as a white-glove service and usually comes with an extra fee. After HDTV purchasers get their sets home and hook them up, they will still need to work to get the digital signals to their systems. Most of the industry’s cable providers do not yet offer high~definition programing, and only about 15% of commercial television stations have switched over to even the lowest improved digital pictures. Worse yet, viewers may need to install antenna before they can even get the digital signals to their new HDTV sets. Another frustration for home-theater seekers is that the current HDTV sets allow owners only to watch high-definition programs, not to record them.

A majority of HDTV consumers could not enjoy high-quality digital pictures because ().

A. they did not tune in to the right channel

B. they did not install the system

C. the market retailers created the confusion on purpose

D. the manufacturers did not have a uniform standard for their sets

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