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单选题
Those removable units used for entrance or exit, and for enclosing other structure contained within the fuselage. Includes passenger and crew doors, cargo doors, emergence exits, etc. Electrical and hydraulic systems associated with door control are included as appropriate.
A
These changeable units are used to connect the inlet and outlet, and are also used to connect other structures contained within the fuselage. Include passenger and crew doors, cargo doors, emergency exits, etc. Whether should contain electrical and hydraulic systems associated with door control based on the current situation.
B
These units were used to combine imports and exits, and also to seal other parts contained in the body. Including passenger and crew doors, cargo hold, emergency exits, etc. Whether should contain electrical and hydraulic systems associated with door control based on the current situation.
C
These units, which can be taken off, were used for entrance and exits, and also to enclose other structures contained in the fuselage. Including passenger and crew doors, cargo doors, emergency exits, etc. Whether electrical and hydraulic systems associated with door control should be included is based on the situation.
答案解析
正确答案：C
