题型:问答题 简答题 —What's today's talk about? —It's about how to be polite when we requests. [ ]A. have B. ask C. make D. order 查看答案
题型:问答题 简答题 PGA液压调速器的弹性反馈机构主要由下列部件组成()。Ⅰ.大反馈活塞Ⅱ.小反馈活塞Ⅲ.阻尼活塞Ⅳ.补偿针阀Ⅴ.反馈指针Ⅵ.阻尼活塞弹簧A.Ⅰ+Ⅱ+ⅢB.Ⅲ+Ⅳ+ⅥC.Ⅰ+Ⅱ+ⅥD.Ⅳ+Ⅴ+Ⅵ 查看答案