【判断题】The ringing of peace bells on Earth Day is practiced only in the West.
【简答题】在△ABC中,若B=60°,c=1,a=4,则b=______.
【简答题】Owing to the delay () the L/C, we are unable to effect shipment () the stipulated time limit.
【简答题】Owing _____ the delay on the part of the suppliers, we must ask you to extend the date of shipment ____ October 10th.
【单选题】调节池的主要作用是什么
D.
调节水中微生物的含量,确保后续生化反应的正常进行
【单选题】若A(2,-4,-1),B(-1,5,1),C(3,-4,1),则 CA ? CB =( )