单项选择题
在硫酸―磷酸介质中,用0.1mol/LK2Cr2O3溶液滴定0.1mol/LFe2+溶液,其计量点电位为0.86V,则对此滴定量最适用的指示剂是()
A.06V)
B、二苯胺磺酸钠(0.84V)
C、二苯胺(0.76V)
D、次甲基蓝(0.36V)
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单项选择题
The boy knew his teacher _____the method of solving the math problem.
A.should
B.might
C.will
D.would
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单项选择题
It is one thing to enjoy actors‟ performance,but it is quite _____to actby yourself
A.another
B.troublesome
C.a
C.a
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