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【单选题】
若用永停滴定法确定某滴定类型的化学计量点,计量点前检流计指针不发生偏转,计量点时检流计指针突然发生偏转,属于此滴定类型的是A.
Na 2 S 2 O 3 滴定 I 2
B.
I 2 滴定 Na 2 S 2 O 3
C.
HCl 滴定 NaOH
D.
AgNO 3 滴定 NaCl
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皮皮学刷刷变学霸
举一反三
【单选题】建筑图中标准的轴线编号,圆圈用( )绘制,直径为( ),字高通常为( )。
A.
细实线 8mm 5mm
B.
单点长划线 800mm 500mm
C.
单点长划线 8mm 5mm
D.
粗实线 800mm 500mm
【单选题】As time went by, they found their efforts to help students ________. [ ]
A.
showed off
B.
took off
C.
put off
D.
paid off
【简答题】A Science Fiction Story: The woman looked at a small (1)____unit on her arm. ‘It’s all right,’ she said to the man. ‘We can breathe the air ... it’s a mixture of oxygen and nitrogen.’ Both of them too...