向两份a mL b mol/L的稀盐酸中分别加入xmL的水和ymLbmol/LBa(OH)2溶液，此时两溶液的pH恰好相等，则x、y的关系符合（式中a、b均大于零，设两溶液混合时的体积有加和性）
| A．y=2ax+b | B．y=ax/(2x+3a) | C．a/2y-3a/2x=1 | D．x=2ay/(a+y) |
相关试题
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
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