两根相距3m的木杆上系一根拉直的绳子,并在绳子上挂一彩珠,则彩珠与两端距离都大于1m的概率为( )。
—Excuse me. Which is the way to the police station?
—Sorry, I'm new here.
— ______ [ ]
A. Nothing serious
B. Good luck
C. Thank you all the same
D. Pleased to hear that
除尘器脉冲阀喷吹的间隔时间过短,会造成喷吹压缩空气的()不能及时恢复,使脉冲气瞬时流量小。