A:二氧化硫浓度
B:氮气浓度
C:二氧化氮浓度
D:PM2.5浓度
⑴ ____
⑵ ____
⑶ ____
⑷ ____
A. The hat is beautiful. It's size 5.
B. These shoes are new and nice.
C. The T-shirt is too small.
D. I wear a red dress. It is size 13.
下列对洋务运动的评述,正确的有( )①引进了西方科学技术②培养了近代军事、科技人才③实现了“自强”的目的④开启了中国工业近代化历程