When the wheel on the left begins to turn clockwise:[img]2011q4/ct_eyyjscm_eyyj

游客2023-10-19 51

问题 When the wheel on the left begins to turn clockwise:

选项 A、the ball will roll to the left.
B、the ball will roll to the right.
C、the tray will stay level and go up.
D、the tray will stay level and go down.

答案 B

解析

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