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【多选题】
网络安全的语义范围包括下列（）A.
保密性：信息不泄露给非授权用户、实体或过程，或供其利用的特性
B.
完整性：数据未经授权不能进行改变的特性即信息在存储或传输过程中保持不被修改、不被破坏和丢失的特性
C.
可用性：可被授权实体访问并按需求使用的特性即当需要时能否存取所需的信息
D.
可控性：对信息的传播及内容具有控制能力
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】A．Because it has plastic wheels. B．Because it has plastic tires. C．Because it has a plastic frame. D．Because it has no metal parts.
【单选题】______ I can see, the two wheels which are supposed to turn round do not turn atound.
A.
As long as
B.
As far as
C.
So long as
D.
As soon as
【简答题】There are ___ wheels on the step. Two wheels are directly installed on the ____, which are called auxiliary wheels. The other two wheels are installed on the step chain to make the step and the step c...
【单选题】如下图所示,利用直流通断法来判断同名端正确的是
A.
电流表读数在开关K闭合很久后才能读数
B.
电流表读数在开关K闭合一瞬间就要读数
C.
在开关K闭合或者断开一瞬间电流表的读数是一致的
D.
电流表读数在开关K闭合很久后读数不为零
【单选题】如下图所示,利用直流通断法来判断同名端正确的是
A.
电源、导线、电流表均为直流。
B.
电源、导线、电流表均为交流。
C.
电源、导线均为直流，电流表为交流。
D.
电源、导线均为交流，电流表为直流。
【单选题】Thomas ________ the army for two years,so he misses his mother very much.
A.
has joined
B.
has taken part in
C.
has been in
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