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【单选题】
Y=14+4X 是1-7岁儿童以年龄(岁)估计体重(市斤)的回归方程,若体重换成国际单位kg,则此方程( C )。 A. 截距改变 B. 回归系数改变 C. 两者都改变 D.两者都不改变A.
B.
C.
D.
D
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举一反三
【单选题】— How did you play in the match? — Well, our team was ahead by 2 to 0 during the first half, but we _____ in the last ten minutes. [ ]
A.
had lost
B.
have lost
C.
were losing
D.
lost
【单选题】.Our team was ahead during the first half, but we _____ in the last ten minutes.
A.
were won
B.
were lost
C.
were beaten
D.
won
【单选题】下列有关金属性质的说法错误的是：（ ）
A.
常温下所有金属都是银白色的固体
B.
在空气中灼烧铜丝，其表面会变黑
C.
铜、银等金属具有良好的导电性
D.
埋在潮湿、疏松、透气的酸性土壤中的铸铁管容易被腐蚀
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