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搜题
【单选题】
常用于检识生物碱的试剂是（）A.
碘化铋钾
B.
盐酸镁粉
C.
醋酸镁
D.
三氯化铝
E.
茚三酮
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皮皮学刷刷变学霸
举一反三
【多选题】在定量分析实验中，报告分析结果常用的三个参数分别是 [填空(1)] ， [填空(2)] ， [填空(3)] .
A.
测定次数
B.
平均值
C.
相对平均偏差或标准偏差
【单选题】He tries _____English well. And he practices _____English every day.
A.
to learn, to speak
B.
learning, speaking
C.
learning, to speak
D.
to learn, speaking
【单选题】.He tries ____ English and he practices _____ English every day.
A.
to learn ; speaking
B.
learning ; speaking
C.
learning ; to speak
D.
to learn ; to speak
【简答题】A．He has to change the topic for his composition. B．He has fallen behind others in English class. C．He hasn't made up his mind as to what to write about. D．The book he borrowed will be due tomorrow.
【单选题】He practices _______ English if he can. [ ]
A.
speaking
B.
to say
C.
to talk
D.
to tell
【简答题】A.He normally practices oral English every day． B.He always speaks English with his best friend． C.He often practices English on the Internet． D.He gets many free materials about oral English．
【单选题】He practices __________ English every day.
A.
saying
B.
speaking
C.
talking
D.
telling
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