問題詳情

19. Scientists defines the melting point as the temperature______  a solid changes to a liquid.
(A) which
(B) when
(C) which at
(D) of
(E) at which

參考答案

答案:E
難度:簡單0.75
統計:A(2),B(0),C(0),D(0),E(6)

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