Why are drifting bottles used? ( )(本题0.5分) A、 To determine the position of a ship. B、 To find the direction of a current. C、 To predict the direction of a ship. D、 To carry message across the ocean.

Why are drifting bottles used? ( )(本题0.5分)
A、 To determine the position of a ship.
B、 To find the direction of a current.
C、 To predict the direction of a ship.
D、 To carry message across the ocean.

出自：华北水利水电大学混凝土结构设计原理

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