计算机存储容量的基本单位是字节,用B表示,计算机中一般用KB(千字节)或MB(兆

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问题:

计算机存储容量的基本单位是字节,用B表示,计算机中一般用KB(千字节)或MB(兆字节)或GB(吉字节)作为存储容量的计量单位,它们之间的关系为:1KB=210B,1MB=210KB,1GB=210MB。一种新款电脑的硬盘存储容量为20GB,它相当于多少KB?(结果用科学记数法表示,a的值精确到0.01)

考点:有理数乘法科学记数法和有效数字
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Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (54) an educational institution, and they are required to study for a (55) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (56) resources to support themselves (57) in this country.

In order to work here the foreigner needs a work permit, (58) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (59) these permits, and there is little that can be done (60) it; it would be extremely unwise for a foreign visitor to work (61) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (62) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (63) part-time jobs while they are studying here.

58().

A.it 

B.what 

C.that 

D.which

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根据2001年燃油污染民事责任公约,()必须强制投保燃油责任险或持有其他财务保证。

A.2000总吨以上的船舶

B.2000总吨以上载运散装货油的船舶

C.1000总吨以上的船舶

D.1000总吨以上载运散装货油的船舶

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建安工程造价中的税金不包括( )。

A.营业税
B.所得税
C.城乡维护建设税
D.教育费附加

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在项目实施阶段,( )应协调处理施工现场周围地下管线和邻近建筑物、构筑物及有关文物、古树等的保护工作,井承担相应费用。

A.承包商
B.咨询工程师
C.业主
D.政府

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离心泵主要改变工作腔内液体的速度,将机械能转化为液体的()。

A.动能

B.压能

C.动能和压能

D.机械能

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