knife的复数

The police connected the knife _____ the murder. Use the fork on the right and the knife on the left（） Look!There （） a knife and fork on the table. He has a knife () to defend himself. Be careful!Don’t cut()with the knife. This is the same knife （） I lost yesterday. The knife and the fork are placed horizontally to the diner which means?????? . How many ______ ( knife) did you buy yesterday? Johnny, you _____ play with the knife, you ______ hurt yourself. Cut the meat () a knife and divide it among four plates. 复数导纳与复数阻抗是互为倒数的关系。 复数的极坐标表示式为A=rejα,式中r称为复数A的模，α称为复数A的辐角（） I have ________ useful knife and my sister has _______ eraser. Knife and spoon are placed to the right of the plate. The fork is on the left. What ________ to the boy a moment ago? —The knife cut his tiptoe. Don't play with the knife. You （） hurt yourself. 您需要刀叉吗？Doyouneed对knife对ndfork？（） 虚数∶复数 bus(复数)__________ ?Johnny, you________ play with the knife, you________ hurt yourself.