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单选题
环控系统的任务是：the task of the environmental control system is to:
A
提供人工增压控制 provide manual pressurization control
B
提供一个可控温度的环境 produce a temperature controlled environment
C
控制地面活门的开和关 control the opening and closing of the ground valve
D
控制从机身排出的空调气流流量 control the rate of conditioned air outflow from the fuselage
答案解析
正确答案：B
