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It's good for people to walk more and drive less. So I'd rather _______ half an hour's walk to work.
医疗上用的生理盐水是0.9%的氯化钠溶液.要配制0.9%的氯化钠溶液100g.其中选用仪器或操作正确的是( )
不等式y+2≤3的正整数解为( )