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【单选题】
表面活性剂是针对某种特定的液体或溶液而言的,表面活性剂的作用是A.
乳化作用
B.
增溶作用
C.
降低表面张力
D.
增加表面张力
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【判断题】In a standard format of business email, it is not necessary for us to begin with date according to the video.
A.
正确
B.
错误
【单选题】In a standard format of business email,s we are not necessary to begin with ___ according to the video.
A.
to
B.
from
C.
subject
D.
date
【单选题】In a standard format of business email, we don’t necessary to begin with ___ according to the video.
A.
To:
B.
From:
C.
Subject:
D.
Date:
【判断题】Formal reports are usually written in a standard format including several parts similar to those in a research article.
A.
正确
B.
错误
【简答题】抓钩本身为一带有()的链板,作为板链中的—个链环,根据钩状物的位置,抓钩可 分成()和()两种。
【简答题】什么是浓厚蛋白水样化?
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