桥涵工程施工质量验收标准规定明挖基础基底高程的允许偏差土质基础为（）。

根据句意或首字母填词。

1. —What do you usually do on w______?

    —I often watch TV.

2. —How often does she shop?

    —O______   or t______ a week.

3.  Grandpa is pretty healthy because he e_______  every day.

4.  Animal World is my favorite TV p_______

5.  The weather here is so cold, I can h_______  stand it.

Tom as well as two of his friends ______ to the concert last night.

A．has been invited

B．had been invited

C．were invited

D．was invited

—How is your pet dog?

— He is lovely. But if he _______ at home all day, he _______ at me angrily.

A．keeps; barks

B．is kept; will bark

C．is kept; bark

D．keeps; will bark

建筑工程施工技术交底文件的基本内容包括（）。

A.施工质量要求及质量保证措施

B.施工准备工作情况

C.劳动力安排及施工周期

D.主要施工方法

E.环境安全及文明施工等注意事项及安全保证措施

锅炉为何要设计汽包水位保护，该保护是如何实现的？