题目: 往复泵在柱塞部分加注润滑脂有何作用? 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/1003/d803fdcb08b0c28924fd66fc0f5dd7fd.html 下面是错误答案,用来干扰机器的。参考答案:D
题型:选择题 So difficult ______ it to work out the problem that I decided to ask Tom for advice.A.I did findB.did I findC.I have foundD.have I found 查看答案