weather! We can't go climbing today.
A:What bad
B:How bad
C:What fine
D:What a bad
如图甲所示,在观察水的沸腾实验中.
若2x+y=0,则x2+xy+y22xy-x2的值为( )
足:A.脚 B.满,充分,量 C.值得
架子十足____ 微不足道____ 画蛇添足____
方案一:纯碱样品 →点燃 测定剩余固体质量