Machines need energy (to function), (whether) it is animal or human muscle, wind

游客2024-01-05 46

问题 Machines need energy (to function), (whether) it is animal or human muscle, wind or (waters) currents, or heat-generated energy, (such as) steam.

选项 A、to function
B、whether
C、waters
D、such as

答案 C

解析

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