锂、钾、钠、锶、钾钠合金等活泼金属与水化合时,夺取水中的氧原子 ,放出氢气和大量的热量,使放出的来的氢气与空气中氧气相混合形成的爆炸性混合物,发生自燃或爆炸。
参考答案:对
Situated on the southeast China coast,Fujian Province is separated by_________180—km strait from Taiwan,__________largest island in China.
A.不填; the
B.a; the
C.a;不填
D.the;a
--Who helped you clean the classroom yesterday?
-- . I cleaned it all by myself.
A. Somebody B. Nobody C. Everybody