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【单选题】
甲乙两技师就“气门哒哒撞击声”进行讨论,技师甲说:凸轮轴磨损是导致该噪声的常见原因;技师:润滑系统出现故障会导致该噪声。下列说法正确的是?A.
甲、正确
B.
甲、不正确
C.
甲正确,乙不正确
D.
甲不正确,乙正确
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【单选题】若 有意义，则x的取值范围