( ) A、 He compared his own map with other maps. B、 He talked with many U.S. captains. C、 He used drifting bottles to check his map. D、 Both B and C.

( )
A、 He compared his own map with other maps.
B、 He talked with many U.S. captains.
C、 He used drifting bottles to check his map.
D、 Both B and C.

出自：华北水利水电大学混凝土结构设计原理

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