皮皮学，免费搜题
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【多选题】
β内酰胺类包括哪些?A.
青霉素类
B.
头孢类
C.
红霉素、罗红霉素、阿奇霉素
D.
庆大霉素、卡那霉素
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A.
He explains how to perform. an easy experiment.
B.
He tells the class about his personal experience.
C.
He provides several examples of sentences.
D.
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A.
how; how
B.
what; that
C.
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D.
how; that
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