机外排气活门构型跳开关的作用是（）
A.左组件失效放行
B.非增压飞行放行
C.右组件失效放行
D.再循环风扇失效放行
参考答案：B
6500毫升=______升5.6平方分米=______平方厘米
4米9分米=______米 8.07立方米=______立方米______立方分米．
—Is this your watch ______ the lost and found case, Jack?
—Yes, ______[ ]
A. at, it's
B. in, it is
C. in, this is
D. for, this is
