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【判断题】
双道法是指企业同时使用网络直接销售渠道和网络间接销售渠道。A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】What is the author's purpose in quoting 'Of course, we can not imagine a life without any friend'?
A.
To show his sympathy for those who hasn't got any friends in life.
B.
To introduce the topic of the quality and quantity of friends.
C.
To disagree with the finding from the research.
D.
To show the author's surprise when heating the finding.
【单选题】Water and air are to human beings. We can not live without them.
A.
harbour
B.
function
C.
definite
D.
essential
【单选题】I型呼吸衰竭最主要的发生机制是
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