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【单选题】
下列各物质可作为缓冲对的是( )
A.
CH 3 COOH-H 2 CO 3
B.
Na 2 CO 3 -H 2 CO 3
C.
CH 3 COOH- CH 3 COONa
D.
NH 3 ·H 2 O-NaCl
E.
HCl-NaCl
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皮皮学刷刷变学霸
举一反三
【单选题】下列哪个设备不属于酸冷结晶机组（）
A.
脱水机
B.
混合冷凝器MK
C.
换热器WT
D.
蒸汽喷射泵
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【多选题】下列哪项属于II型变态反应的特点
A.
抗原抗体复合物存在于细胞膜上
B.
介导的抗体是IgG和IgM
C.
具有明显的个体差异和遗传趋向
D.
有补体.吞噬细胞.MK细胞参与
E.
后果是靶细胞破坏
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【单选题】Sam has been appointed ________ manager of the engineering department to take ________ place of George.(2012·重庆)
A.
/；/
B.
the；/
C.
the；the
D.
/；the
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【单选题】Sam has been appointed _______ manager of the engineering department to take ____ place of George.
A.
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【单选题】— Could you tell me _________? — He often takes a bus.
A.
what does Tom usually do
B.
where is the post office
C.
how Tom often goes to work
D.
why Tom sometimes comes late
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【单选题】Tom is late. What ________ to him?
A.
should have happened
B.
must have happened
C.
can have happened
D.
would have happened
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Java Servlet Port
B.
Java Server Paper
C.
Java Server Pages
D.
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【单选题】Sam has been appointed _______ manager of the engineering department to take ____ place of George.
A.
/,/
B.
the; the
C.
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/, the
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【单选题】下列哪个设备不属于酸冷结晶机组（）
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【多选题】下列哪项属于II型变态反应的特点
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