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【简答题】
思维的基本单位是( ),语言的基本单位是( )
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【判断题】光电效应可以证明光具有粒子性,因此光不是一种波。
A.
正确
B.
错误
【简答题】Man-made satellites have been sent up into space by many countries. These satellites go round the earth and help us to learn more about the earth, the weather and other things. Most countries use thes...
【判断题】机油流动性越强越好。
A.
正确
B.
错误
【单选题】在Compendex数据库中,叙词Satellites和相关词语的关系如下: Used for:Artificial satellites; Broader Terms:Spacecraft; Narrower Terms:Communication satellites,Geodetic satellites。 其中不可用于检索的词是(    )。
A.
Artificial satellites
B.
Geodetic satellites
C.
Spacecraft
D.
Communication satellites
【简答题】阅读理解 Man-made satellites have been sent up into space by many countries. These satellites go round the earth and help us to learn more about the earth, the weather and other things. Most countries use...
【单选题】关于VIN码LSVHJ133022221761表述正确的是( )。
A.
上海大众汽车,2002年生产
B.
一汽大众汽车,2012年生产
C.
上海大众汽车,2012年生产
【单选题】在SQL语句中,自身连接必须要定义表的_______。
A.
主键
B.
别名
C.
外键
D.
连接属性
【判断题】直链淀粉含量在15-20%的稻米(粳米的直链淀粉含量大多在此范围),蒸煮时米饭柔软,黏性较大,涨性小
A.
正确
B.
错误
【单选题】How is maximum coverage provided by satellites in the GMDSS?
A.
There are four satellites in polar orbit.
B.
There are four satellites in geostationary orbit.
C.
Each service (INMARSAT-F, -B, -C and –M) has four satellites in orbit.
D.
GMDSS optimizes coordinated use of COSPAS-SARSAT satellites.
【单选题】Compared with the geostationary orbit satellites, LEO will require . 【 】
A.
less complex satellites and more complex user terminals
B.
more complex satellites and simpler user terminals
C.
the same satellites and simpler user terminals as well
D.
less complex satellites and simpler user terminals
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