When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.

A.aimed at the source of the flames

B.fogged above the equipment

C.shot off a flat surface onto the flames

D.used to shield against electrical shock

（）是我国优良地方品种太湖猪的一个品系，以高繁殖力和肉质美而著称于世。

A.香猪

B.梅山猪

C.金华猪

D.藏猪