Energy is defined ___ the ability to do work.
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多項選擇題
We can easily see from the definition of k _______ the ratio of a force _______ a length that the unit of elastic potential energy （）
We can easily see from the definition of k _______ the ratio of a force _______ a length that the unit of elastic potential energy （）
A.by……with
B.by……to
C.as……with
D.as……to
單項選擇題
分析一下它的頻譜,就不僅能知道某物質(zhì)是由什么樣的原子或分子構(gòu)成的,而且也能知道它們是按什么樣
分析一下它的頻譜,就不僅能知道某物質(zhì)是由什么樣的原子或分子構(gòu)成的,而且也能知道它們是按什么樣
的相對量而存在的。 Analysis of its spectrum can tell not only __________ atoms or molecules a substance is composed, but ___________ relative amounts they are present.A．what…whatB．that…thatC．of what…in whatD．by that…at that