28-3=____
36-2=____
47-3=____
45-1=____
请你用英语描述你同桌的衣着。
This is ……. He/ She……. Her/ His name is……. She/ He is……years old. Look, he's/she's is wearing…….
用如图甲所示装置探究萘熔化时温度的变化规律。请回答下列问题:
我国缺水最严重的地区是