皮皮学，免费搜题
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【判断题】
实验过程中，为了防止乙醇挥发，不可以打开滴液漏斗的玻璃塞。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Fill in the blanks with how much/how many . 1. pairs of jeans do you want? 2. is a new pair of shoes? 3. are his pants? 4. shirts does she have? 5. does his sweater cost?
【单选题】Why does the woman say: “I should have taken more T-shirts?”
A.
Because she thinks she should wear more fashionable clothes.
B.
Because she thinks she should wear T-shirt on the beach.
C.
Because it was really hot in Singapore.
【多选题】下列结构中具有β羟基的化合物有()()()()()
A.
1, 8-二羟基蒽醌
B.
1, 3-二羟基蒽醌
C.
1,3, 4-三羟基蒽醌
D.
1, 8-二羟基-3-羧基蒽醌
E.
1,4, 6-三羟基蒽醌
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