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【简答题】
如图，一根木棒（AB）长2a，斜靠在与地面（OM）垂直的墙（ON）上，与地面的倾斜角（∠ABO）为60°，若木棒A端沿直线ON下滑，且B端沿直线OM向右滑行（NO⊥OM），于是木棒的中点P也随之运动，已知A端下滑到A'时，求中点P随之运动到P'时经过的路线长．
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【单选题】( )港位于意大利亚平宁半岛西南海岸那不勒斯湾的顶端,濒临第勒尼安海的东侧。又名那波利港,是意大利的主要海港之,一现在已经发展成为意大利的主要炼油中心之一,也是钢铁工业中心之一。
A.
那不勒斯
B.
热那亚
C.
威尼斯
D.
焦亚陶罗
【单选题】When the machinery spaces are in the periodic unmanned condition, ____ shall be immediately available and on call to attend the machinery space
A.
the chief engineer
B.
the designated engineer from shipyard
C.
the designated duty officer in charge of the engineering watch
D.
the designated surveyor from classification society
【单选题】What is learned about Ms. Trevett?
A.
She has worked as a journalist.
B.
She currently works for Idaho University.
C.
She majored in television and radio journalism.
D.
She earned her doctorate from the San Marcos University's School of Journalism.
【单选题】Were anything to happen, I ______ immediatel y.
A.
return
B.
returned
C.
didn ’ t return
D.
would return
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