可燃液体表面或容器内的蒸气与空气混合而形成混合可燃气体或液体,遇火发生一闪即灭的瞬间火苗或闪光,这种现象称()。
A.受热自燃
B.闪燃
C.着火
D.本身自燃
参考答案:B
The manager was worried about the press conference his assistant ________ in his place but,luckily, everything was going on smoothly.[ ]
A.gave
B.gives
C.was giving
D.had given
在清朝的大臣中,有见识的主张严禁鸦片的是()