【判断题】甲醇合成催化剂主要含有氧化铁,催化剂能够降低反应的活化能。
【单选题】Who was the old woman ______ at yesterday's meeting?
【单选题】患者女性,30岁,已婚,继发性闭经6个月,患者首选的检查为
【单选题】—Is there________ book by Mo Yan? —Yes. It’s on______ bookshelf over there.
【单选题】When we saw the road_______with snow, we decided to spend the holiday at home.