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【多选题】
下列多元弱酸能分步滴定的有( )A.
H2SO3(Ka1=1.3x10-2,Ka2=6.3x10-8)
B.
H2CO3(Ka1=4.2x10-7,Ka2=5.6x10-11)
C.
H2C2O4(Ka1=5.9x10-2,Ka2=6.4x10-5)
D.
H3PO3(Ka1=5.0x10-2,Ka2=2.5x10-7)
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【简答题】设半径r=2.5,编程计算相应圆的周长、圆的面积和圆球的体积。要求:用函数scanf输入数据,计算结果取小数点后2位。
【单选题】I’d like to buy a present for my father’s birthday, ________at a proper price but of great use.
A.
one
B.
it
C.
that
D.
this
【单选题】—Can I help you? —I’d like to buy a present for my father’s birthday, at a proper price,but of good use.
A.
that
B.
one
C.
it
D.
which
【单选题】-Can I help you? -I’d like to buy a present for my father’s birthday, at a proper price but of great use.
A.
it
B.
everything
C.
that
D.
one
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