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【单选题】
新型病毒正式命名是什么?A.
SARS
B.
MERS
C.
2019-nCov
D.
COVID-19
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【单选题】The book was written in 1946, _____ the education system has witnessed great changes.
A.
when
B.
during which
C.
since when
D.
since then
【简答题】( )是美国国家标准局公布的第一个数据加密标准,它的分组长度为位,密钥长度为56位。
【简答题】()是美国国家标准局公布的第一个数据加密标准,它的分组长度为()位,有效密钥长度为()位。
【单选题】The book was written in 1946, the education system has witnessed great charges.
A.
when
B.
during which
C.
since then
D.
since when
【单选题】The book was written in 1946, the education system has witnessed great changes. [ ]
A.
when
B.
during which
C.
since then
D.
since when
【单选题】控制食品中农药残留的措施是加强对农药生产和经营管理，( )和制定和执行食品中农药残留限量标准。
A.
适当选择农药品种
B.
减少农药产量
C.
安全合理使用农药
D.
限制农药销量
【简答题】The book was written in 1946, ___ ___ the education system has witnessed great charges. A．when B．during which C．since then D．since when
【单选题】The book was written in 1946, _______ the education system has witnessed great changes.
A.
since then
B.
when
C.
since when
D.
during which
【简答题】()是美国国家标准局公布的第一个数据加密标准，它的分组长度为()位，密钥长度为( )位。
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