试判断下列分子哪些是极性的。(1)HBr(2)I2(3)CCl4(4)CH2Cl2(5)CH3OH(6)CH3OCH3

试判断下列分子哪些是极性的。
(1)HBr(2)I2(3)CCl4
(4)CH2Cl2(5)CH3OH(6)CH3OCH3

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