炉水中可能存在哪些不利的化学反应?
参考答案:
32. It is reported that the scientists in our country are ______ all possible ways to control H1N1 flu.
A.operating
B.designing
C.replacing
D.Exploring
天文三角形的六要素(三边、三角)均应()。
A.大于0
B.小于180
C.小于360
D.A和B