1. Which of the following statements concerning van der Waals interaction is correct?
(A) van der Waals interaction is a strong force between molecules.
(B) van der Waals interaction occurs only when two molecules are close together.
(C) van der Waals interaction is a hydrophobic interaction between molecules.
(D) van der Waals interaction is a form of covalent bond.

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統計: A(0), B(1), C(0), D(1), E(0) #3222878

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