问题
选择题
Finally, tired _____ happy, we took the subway back home.[ ]
A. and
B. but
C. or
D. more
答案
答案：B
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Finally, tired _____ happy, we took the subway back home.[ ]
A. and
B. but
C. or
D. more
答案：B
倒入乙中，混合后再把乙中盐水的一半倒入甲中，混合后又把甲在的一部分盐水倒入乙中，使甲乙两容器中的盐水同样多。最后乙中盐水的浓度为多少（）