In 1991, Congress levied a 10 percent luxury tax on yachts over $100,000. The tax brought in far less than was anticipated, they must have passed the legislation thinking the demand for yachts was more ___ than it actually was.
A.
elastic
B.
inelastic
C.
unit elastic
D.
none of the above
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【简答题】下面给定的表定义语句中,没有定义的完整性约束是()。 CREATE TABLE tb_score( sno char(10)NOTNULL, cno char(6)NOTNULL, grade double, CONSTRAINT pk_sc PRIMARY KEY(sno,cno));A. 参照完整性约束 B. 自定义完整性约束 C. 实体完整性约束