Air quantity is measured in cubic feet of air per minute （cfm).

A. 燃油计量活门

B. 增压和关断活门

C. 低压关断活门

D. 以上都不正确

A. 8

B. 10

C. 12

A. 四级低压压气机和四级低压涡轮

B. B.一级风扇叶片、三级低压压气机和四级低压涡轮

C. C.三级风扇叶片、三级低压压气机和九级低压涡轮

D. D.三级低压压气机和四级低压涡轮

A. 风扇叶片件号

B. 风扇叶片序号

C. 重量矩

D. 风扇叶片重量

A. 7

B. 5

C. 6

A、Enclosing

B、Capturing

C、Receiving

D、Blowing

A、The rate of airflow through the hood

B、The material of the hood

C、The shape of the hood

D、The location of the hood