甲数是685,乙数是523,甲数减去______,就和乙数相等.
685-523=162,
答:甲数减去162,就和乙数相等.
故答案为:162.
American English has so many _________ because the American people have come from all over the world.
A.grammar
B.vocabulary
C.pronunciations
D.dialects
查询借阅了两本和两本以上图书的读者姓名和单位,应使用SQL语句
A.SELECT姓名,单位FROM读者; WHERE借书证号IN; (SELECT借书证号FROM借阅; GROUP BY借书证号HAVING COUNT(*)>=2)
B.SELECT姓名,单位FROM读者; WHERE借书证号EXISTS; (SELECT借书证号FROM借阅; GROUP BY借书证号HAVING COUNT(*)>=2)
C.SELECT姓名,单位FROM读者; WHERE借书证号EXISTS; (SELECT借书证号FROM借阅; GROUP BY借书证号WHERE COUNT(*)>=2)
D.SELECT姓名,单位FROM读者; WHERE借书证号IN; (SELECT借书证号FROM借阅; GROUP BY借书证号WHERE COUNT(*)>=2)