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【单选题】
PLC 中的主从通讯方式属于（ D ）国际标准A.
异步通信
B.
同步通信
C.
串口通信
D.
.IEEE802通信
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举一反三
【单选题】The word perpetually in Paragraph 3 is closest in meaning to______.
A.
continually
B.
permanently
C.
privately
D.
publicly
【简答题】We often stay _____ home and watch TV when we are free.
【简答题】A．apparently B．indirectly C．regularly D．greatly
【单选题】One of the many oddities of migration policy is that immigrants coming in to work permanently are usually a minority of those who arrive legally. Most【1】countries admit migrants mainly on grounds that...
A.
host
B.
hostage
C.
friend
D.
friendly
【单选题】Sandy looks _______in a _______hairstyle.
A.
greatly ; 1990’s
B.
great;1990s’
C.
greatly;1990s
D.
great; 1990s
【简答题】A．hard B．easily C．helpfully D．greatly
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