Everyone who works for the railroad ______ a uniform.

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• Everyone who works for the railroad ______ a uniform.A.supplies with B.supplies toC.is suppied to D.is supplied withsupply with 与supply to有什么区别?这里应该选哪个?给出的答案选D
• Everyone who works for the railroad ______ a uniform.
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• 将溶质质量分数为a%，物质的量浓度为c1 mol•L-1的稀H2SO4蒸发掉一定量的水，使其溶质质量分数为2a%，此时物质的量浓度为c2 mol•L-1，则c1和c2的数值关系是（　　） A.c2=c1 B.c2＜c1 C.c2＞2c1 D