最常用的预防接种途径是（） A.皮下注射 B.皮上划痕 C.皮内注_爱下问搜题

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问题单项选择题 A1/A2型题

最常用的预防接种途径是（）

A.皮下注射

B.皮上划痕

C.皮内注射

D.喷雾吸入

E.肌内注射

答案

参考答案：A

问答题

某硝酸铵（NH₄NO₃）样品，测知含氮量为37%，则该样品中含有的杂质可能是（　　）

A．（NH₄）₂SO₄

B．CO（NH₂）₂

C．NH₄HCO₃

D．NH₄Cl

选择题

— Where is Lily, Lucy? I cannot find her anywhere.

— She _____ have been off long. I saw her clean the window just now. [ ]

A. shouldn't

B. can't

C. mustn't

D. needn't