皮皮学，免费搜题
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【单选题】
适用于精密的分析实验和科学研究,可作为基准物质的试剂规格是( )A.
优级纯
B.
化学纯
C.
实验试剂
D.
分析纯
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】Why does the professor say thisΩ?
A.
To warn the student of the danger of failing.
B.
To encourage the student to borrow books.
C.
To tell the student she started too late.
D.
To indicate he is not concerned about the student's problem.
【单选题】Sometimes a few words of _____ from his teacher to the one who has just failed in the exam may encourage him to stand up. [ ]
A.
compromise
B.
confidence
C.
comfort
D.
consultant
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