下列哪些保护330MW机组设有延时（）。A、炉膛负压保护；B、汽包水位保护；C、全炉

根据课文内容填出所缺短语。（共5小题，每小题1分，满分5分）

小题1:….but in 1963 I helped Nelson Mandela ___________________ some government buildings.

小题2:The design of the Amber Room was ____________________ popular in those days.

小题3:Both the Summer and Winter Olympic Games are held __________________. (定期地)

小题4:In September 1941, the Nazi army was near St Petersburg. This was a time when the two countries were __________________.

小题5:In relief Daisy __________________. “Don’t laugh,” said the elephant.

延伸卡环一般用于（）。

A.孤立前磨牙

B.缺隙侧松动天然牙的邻近基牙

C.最后孤立倾斜的磨牙

D.健康正常的基牙

E.游离缺失的基牙

用于记载会议主要精神和议定事项的公文是（）

何谓坡度尺控制法？