【单选题】
我国高速列车目前使用的集便装置主要包括利用重力实现集污的 集便器和利用真空负压原理实现集污的 集便器。
A. 压力式，真空式
B. 重力式，真空式
C. 真空式，重力式
D. 集中式，重力式
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答案
B
解析
暂无解析
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