液压系统压力的大小由()决定
A、溢流阀
B、油泵
C、负载
D、流量
参考答案:C
要从字符串“全国计算机等级考试”中取出子串“等级考试”,应该使用函数( )。
A.SUBSTR("全国计算机等级考试",6,4)
B.SUBSTR("全国计算机等级考试",6,8)
C.SUBSTR("全国计算机等级考试",11,4)
D.SUBSTR("全国计算机等级考试",11,8)
The reason__________ I didn't come to the party was_________I didn't get the invitation. [ ]
A. why; because
B. why; that
C. for which; because
D. in which ; that