题型:问答题 简答题 I have got a lot of CDs of the most popular singers. I can't decide _____. [ ]A. which one to listen to B. to listen to which one C. which one should I listen to D. what I should listen to 查看答案
题型:问答题 简答题 JP32举高喷射消防车为了防止上车开始回转式的液压冲击,使转台平稳启动,在回转油路中设置了两个二次调压阀,调定压力为()bar。A.1000B.1200C.1500D.800 查看答案