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【单选题】
IP协议是TCP/IP____上使用的协议。A.
应用层
B.
网络访问层
C.
网络层
D.
传输层
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皮皮学刷刷变学霸
举一反三
【单选题】In the four definitions of language, which one is different from others?
A.
“Language is a purely human and non-instinctive method of communication ideas, emotions and desires by means of voluntarily produced symbols”.
B.
“Language is the institution whereby humans communicate and interact with each other by means of habitually used oral- auditory symbols”.
C.
“From now on I will consider language to be a set of sentences, each finite in length and constructed out of a finite set of elements”.
D.
“ Language is the system of human communication which consists of the structured arrangement of sounds into larger units ” .
【简答题】为什么化学反应通常不能进行到底?
【简答题】反应达到平衡时,宏观和微观特征有何区别?为何化学反应通常不能进行到底?