刀具刃磨后,刀刃的直线度和完整程度越好,加工出的工件表面质量越好。
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壶口瀑布位于()交界的黄河段,气势奔腾,有“天下黄河一壶收”之说。
A. 晋陕
B. 晋豫
C. 青陇
D. 豫鲁
Which of the following is true of an index used to support a UNIQUE constraint?()
A. It must have the UNIQUE attribute.
B. It cannot be created explicitly by the user.
C. It must have the UNIQUE and CLUSTER attributes.
D. It must have the UNIQUE WHERE NOT NULL attribute.
浓香型白酒典型风格是具有己酸乙酯为主体的复()、()、()、()。