矿粒与气泡相互粘附有哪两种方式？
参考答案：
气泡与矿粒多次碰撞而粘着；溶解于水中的气体在矿粒表面析出而粘着。
When the headmaster announced his plan in public at the school's opening ceremony, the ________
of the students present________ against it. [ ]
A. majority; were
B. most; were
C. most; did
D. majority; did
可以判定某个日期表达式能否转换为日期或时间的函数是（ ）。
A．显示报表中的字段名称或对记录的分组名称
B．显示报表的标题、图形或说明性文字
C．显示本页的汇总说明
D．显示整份报表的汇总说明
