在Word97的默认状态下，先打开了一个f1．doc文档，又打开了f2．doc文档，则

A．文档f1．doc的窗口遮蔽了文档f2．doc的窗口

B．打开的f2．doc的窗口遮蔽了f1．doc文档的窗口

C．打开了f2．doc的窗口，f1doc文档的窗口被关闭

D．两个窗口并列显示

（）contains the wheelhouse with the control station,the chartroom where charts,pilot books and publications are kept,and the radio room.

A.The doube bottom

B.The cofferdam

C.The navigating bridge

D.The superstucture