《凡尔赛和约》规定奥匈帝国承担发动战争的责任。和约内容主要包括：

（1）阿尔萨斯和柏林交还法国；莱茵河西岸50千米内不得设防；承认荷兰独立，部分领土划归波兰等国。

（2）德国海外殖民地交给战胜国进行“委任统治”。

（3）发展德国的普遍义务兵役制。

（4）德国应支付大量战争赔款。

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洁净度要求较高的工厂，绿地率不小于( )。

A．20%

B．30%

C．50%

D．40%