【单选题】
当飞机在空中，水箱水量低于5%时和飞机在地面时，水箱关断活门的位置分别为？___
A. 关闭；关闭。
B. 关闭；打开。
C. 打开；打开。
D. 打开；关闭。
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答案
B
解析
暂无解析
相关试题
【单选题】
APU提供的引气来自于：___
A. 压气机并通过防喘活门供给飞机气源系统
B. 负载压气机并通过进口导向叶片供给飞机气源系统
C. 压气机并通过引气活门供给飞机气源系统
D. 负载压气机并通过引气活门供给飞机气源系统
【单选题】
从何处可以进行APU紧急关车___
A. APU控制面板,火警面板,外电源控制面板
B. 加/抽油面板,外电源控制面板和驾驶舱
C. APU不能从飞机外部关车
D. 火警面板或外电源控制面板
【单选题】
对该APU描述正确的是：___
A. 两级轴流式压气机和三级离心式涡轮
B. 三级轴流式压气机和两级离心式涡轮
C. 两级离心式压气机和三级轴流式涡轮
D. 三级离心式压气机和两级轴流式涡轮
【单选题】
APU可以看作是由下面哪些部分组成的：___
A. 动力部分，引气部分，电源部分
B. 引气部分，附件部分，电源部分
C. 负载压气机，电源部分，动力部分
D. 动力部分，负载压气机，附件部分
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社会的物质性体现在___
A. 劳动是社会产生和存在的决定性因素
B. 在社会中不存在精神的现象和活动
C. 物质资料的产生是社会历史的前提
D. 全部社会生活在本质上是实践的
E. 社会生活中不存在物质关系以外的其他关系
