既为喉科亦是眼科的常用药是()
A.铅丹
B.青葙子
C.夏枯草
D.硼砂
参考答案：D
They haven't finished their work. Maybe they have some trouble ______ it. [ ]
A. on
B. at
C. in
D. with
当SQL的子查询返回的值是一个集合时，下列选项中的______不是在比较运算符和子查询中使用的量词。
A．REST
B．IN
C．ALL
D．ANY
