抽出式通风也称负压通风,当主要通风机运转时,造成风硐中空气压力高于大气压力,迫使空气从进风井口进入井下,再由出风井排出。
参考答案:错
— I am afraid of our head teacher. How about you?
— Me too. He is so serious that the class ____ when he comes into the classroom.
A.will go quietly
B.goes quiet
C.is going to quietly
D.will go quiet
甲因急于继承其父财产而生杀父之念,一日雨夜乘其父病重之机,欲为其注射毒药。刚拿起注射器,忽听一声惊雷致使注射器掉在地上。他想到了杀父是大逆不道,要为天理所报应,便放弃了杀害行为。甲的行为属于( )。
A.杀人中止
B.杀人未遂
C.杀人预备
D.不构成犯罪