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【单选题】
表面活性剂系指分子中同时具有亲水基团和亲油基团，具有很强的表面活性，能使液体的表面张力显著下降的物质，常用做增溶剂、起泡剂、消泡剂、去污剂、抑菌剂或消毒剂、乳化剂、润湿剂等。HLB值在8~16的表面活性剂，在药剂中常用作（）A.
W/O型乳化剂
B.
O/W型乳化剂
C.
润湿剂
D.
增溶剂
E.
消泡剂
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皮皮学刷刷变学霸
举一反三
【多选题】Complete the passage with items from the box. 在空白处填上合适词汇的选项。
A.
everything
B.
difficult
C.
carefully
D.
teacher E .answer Learning a new language is 1 . Do you want to be a good learner? Here are a few ways. Listen to the 2 carefully in class. Listen to what the teacher says carefully , and then write them down. But you don ’ t need to write down 3 the teacher says. Practice more. Y ou should speak out a lot and 4 the questions as many as possible. Do your homework 5 . Exercises are important to you. If there is anything you don ’ t understand , ask the teacher at the next class.
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【简答题】Unit 4 Listening Task 4 Mr. Smith is reporting to a lost card to his bank. Listen to the conversation and answer the following questions. 1.When did Mr. Smith lose his card? 2. What information is nee...
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