【多选题】生产性毒物的无害化排放是通风防毒工程的重要准则,而净化是无害化排放的主要手段。生产性毒物中有害气体净化的方法主要有()。
【单选题】This is the man last night. [ ]
【单选题】We haven't seen each other for 20 years, but I recognized him _____ I saw him. Which of the following is wrong ?
【单选题】This is the man__________last night. A.whom I saw him B.whom I saw C.which I saw D.who I saw him
【单选题】This is the man()last night.
【单选题】Although we hadn't met for 20 years, I recognized him ______ I saw him.
【单选题】 【 2019 武汉】“时代楷模”钟扬援藏 16 年,足迹遍布西藏最偏远、最艰苦的地区,率领团队在青藏高原为国家收集了数千万颗植物种子。科学家钟扬的事迹启示我们