問題詳情
34.( )進行「力的測量」實驗時，施加於彈簧的力F與彈簧伸長量X的關係，如圖所示，下列敘述何者正確？
(A)伸長量X與受力F不成正比，不能用來測力的大小
(B)當施力介於20～60公克重時，才可用此彈簧來測量
(C)凡是大於20公克重的施力，均可用此彈簧來測量
(D)由圖可以預測當施力為70公克重時，彈簧的伸長量為17.5公分。 
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