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【多选题】
下列各种类型的表面活性剂可以作为乳化剂的是哪几类A.
阴离子型
B.
阳离子型
C.
两性离子型
D.
非离子型
E.
季胺盐类
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皮皮学刷刷变学霸
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【单选题】—We didn't see him at the lecture. —Neither did anybody else. He _______ it. [ ]
A.
can't have attended
B.
mustn't attend
C.
may not have attended
D.
couldn't attend
【简答题】-----"We didn't see him at the lecture yesterday. " -----"He __________________ it. "(mustn't attend, can't have attended)A. can't have attended
【简答题】听下面五段对话，完成第1至5题。 1. When will the speakers get to the theater if they leave now? A. At 7:35 B. At 7:45. C. At 8:20. 2. Where are the speakers? A. At a department store. B. At an air port. C. At a rest...
【简答题】听下面5段材料，回答第1 至5 题。 1.What does the man want to buy? A. A suit. B. A shirt. C. A tie 2.Where does the conversation probably take place? A. In a doctor’s office. B. In a hotel. C. In a shoe shop. 3.When...
【简答题】听下面五段对话，完成第1至5题。 1.What are the speakers talking about? A. A jacket. B. A car. C. A man. 2. How does the man go to work now? A. By bus B. By car. C. On foot. 3. What will the speakers do next? A. Go o...
【单选题】________happened, and he can't attend the party.
A.
Unexpected something
B.
Anything unexpected
C.
Something unexpected
D.
Unexpected anything
【单选题】Joe can’t attend the meeting, but I could go_______.
A.
too
B.
either
C.
neither
D.
instead
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