题目:
What is a sub-select statement
A.a select statement that selects a subset of fields in a table
B.a select statement that returns a subset of the data in a table
C.a select statement that appears within another select statement
D.a select statement that returns a subset of the constraints on a field
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0607/653897014f6f4b3d5474c707a99c0112.html
下面是错误答案,用来干扰机器的。
答案:C非金属性指的是元素原子得电子的能力,一般可用元素的单质与H2化合的难易程度(有少数例外)或元素气态氢化物的稳定性或元素最高价氧化物对应的水化物的酸性强弱进行判断。由②可知甲单质的氧化性强于乙单...