写出一个经过(0,-2)的抛物线解析式______.
设抛物线的解析式是y=x2+b,把(0,-2)代入得:b=-2,
则抛物线的解析式是:y=x2-2.
答案不唯一.
—Does the idea of working abroad ________ you?
—Yes. But I have no chance.
A.lead to
B.adapt to
C.appeal to
D.contribute to
写出下列反应的文字表达式,并标出其基本反应类型(填化合反应或分解反应)
(1)加热氯酸钾和二氧化锰的混合物:______(______);
(2)磷在空气中燃烧______(______).