441.主框架包括隔框、舱壁、防火墙、纵梁、龙骨、隔框周围的开口等。( )

　Main frame: including compartment, bulkhead, firewall, beam, keel, exterior opening of compartment, etc.

　Main Frame: Includes items such as frames,bulkheads ,firewalls,stringers,keel,frames around openings, etc.

　Main frame: including compartment, bulkhead, firewall, beam, keel, opening inside compartment, etc.

正确答案：B

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