A.10厘米
B.15厘米
C.50厘米
D.55厘米
答案:B
They have been woking on this project for one month. It seems they need ______ month to finish it. [ ]
A. more
B. other
C. another
D. the other
按要求写出下列反应的化学方程式并在括号内注明反应的基本类型:
(1)铁在充足的氧气中燃烧 ____________________________ ( )
(2)实验室加热高锰酸钾制氧气 ______________________________( )
(3)实验室用双氧水制氧气(二氧化锰为催化剂) _________________________________ ( )