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搜题
【单选题】
密封指将容器或器具用适宜的方式封闭,以防止外部( )侵入。A.
微生物
B.
水分
C.
粉尘
D.
空气
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知识点：
皮皮学刷刷变学霸
举一反三
【判断题】C0为通用计数器,只能进行加计数,当计数的当前值=设定值后,即使再有计数输入信号,计数器当前值保持为设定值不变。而C200为双向计数器,当为加计数工作时,当计数的当前值=设定值后,如再有计数输入信号,计数器当前值仍继续增加。
A.
正确
B.
错误
【多选题】Regarding an IPsec security association （SA）， which two statements are true？（）
A.
IKE SA is bidirectional.
B.
IPsec SA is bidirectional.
C.
IKE SA is established during phase 2 negotiations.
D.
IPsec SA is established during phase 2 negotiations.
【简答题】Norwegian farmers and fishermen have an important influence because _________.
【简答题】Once upon a time, there were two fishermen who were good at fishing. One day they went to a lake to . One of them fishing alone by himself the other was an outgoing person who loved to friends with di...
【简答题】刘徽撰《九章算术注》，最大的贡献是创立了() A.“图验法” B.“今有术” C.“齐同术” D.割圆术
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