11.已知某种轮船的载重量为500吨,容积为2000立方米.现有甲、乙两种货物待装,甲种货物每吨5立方米,乙种货物每立方米0.5吨,求怎样装货,才能最大限度利用船的载重量和容积.设装甲、乙两种货物分别为x吨、y吨,于是有方程组( )
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| A. | $\left\{\begin{array}{l}{x+y=500}\\{5x+0.5y=2000}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{x+y=500}\\{5x+2y=2000}\end{array}\right.$ | ||
| C. | $\left\{\begin{array}{l}{x+y=500}\\{0.2x+0.5y=2000}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{x+y=500}\\{0.2x+2y=2000}\end{array}\right.$ |