题目内容

We _____________ had time to catch the train.

A. bare
B. barely

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The boy likes to walk on the sand with ____________ feet.

A. bare
B. barely

His wealth proved a ____________ to him.

A. curse
B. cursed

All his life, he’s been ___________ with bad luck

A. curse
B. cursed

1.10.00cm3NaCl饱和溶液重12.003g，将其蒸干后得NaCl 3.173g，试计算：（1）溶液的质量分数。（2）溶液物质的量的浓度。（3）溶液的质量摩尔浓度。（4）盐的摩尔分数。（5）水的摩尔分数。