题目

Do you know the young lady ____ your mother is talking?A.whoB.whomC.with whomD.which 答案:C解析:talk with 和某人谈话。已知向量=(6,-4),=(0,2),=+l,若C点在函数y=sinx的图象上,实数l=(    ) A.      B.       C.-   D.-
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