将一定体积密度为1.3g/cm3的硫酸溶液逐滴滴入到BaCl2溶液中，直到沉淀恰好完全为止。己知反应后所得溶液的质量等于原BaCl2溶液的质量，则原硫酸溶液浓度为
| A．33.9% | B．31.0% | C．6.65 mol/L | D．5.58 mol/L |
相关试题
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 |
They use computers to keep the traffic _______ smoothly.
| A．being run | B．run | C．to run | D．running |
If you leave the club, you will not be_____back in .
| A．received | B．admitted | C．turned | D．moved |
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