It is a spectacular __________ as the fireworks are set off and light up the who sky during the Spring Festival.

A．look

B．view

C．scenery

D．sight

采用均压技术防灭火时必须有专人定期观测与分析采空区和火区（）等的状况，并记录在专用的防火记录薄内。

A、漏风量

B、漏风方向

C、空气温度

D、防火墙内外空气压差