Nd：YAG激光治疗后发性白内障，主要利用（）。 A.激光光致热效应 B.激光光致分

为证明某空杯内充满着空气，小红同学把杯口向下使杯子浸没在盛水的盆里，她将观察到的现象是_________________。请你用其他方法证明空杯内充满着空气吗，请简述操作方法和现象。

A．条件(1)充分，但条件(2)不充分
B．条件(2)充分，但条件(1)不充分
C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分
D．条件(1)充分，条件(2)也充分
E．条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分

Fill in the blanks with the given words in their proper forms. (用括号内所给单词的适当形式填空，

每空限填一词。)

1．We all know that Tom's mother is a very _________ business woman. (succeed)

2．A car accident happened in our street last night. _________, no one was injured. (luck)

3．My sister _________ fish in that market early every morning. (sales)

4．It's _________ for her to get school so late because she is always the first one to get to school. (usual)

5．Suddenly, we heard a big ________ in the next meeting hall. (argue)

6．In some maths tests, the students are allowed to use the _________ calculators. (electric)

保护是多任务或多用户系统中加强资源管理的方法，用来防止多个程序或多个任务间彼此干扰，同时，保护机智还用来避免对存储器非法操作。

施工用电系统投入运行前，应建立（），设立运行、维修专业班组并明确职责及管理范围。