A:甲烷燃料电池的能量利用率比甲烷燃烧的能量利用率大
B:该燃料电池在使用过程中电解质溶液的浓度和性质均发生变化
C:负极反应式:CH4+3H2O-8e-=CO32-+7H+
D:正极反应式:2O2+4H2O+8e-=8OH-
根据下列提示, 用英语写一篇题为"My Hobby"的短文, 不少于50词。
提示: (1)What is your hobby? (2)When did you start it? (3)Why do you like doing it? (4)How much time do you spend on your hobby?(5)What kinds of things have you learnt from your hobby?
My Hobby
读气温年变化曲线和逐月降水量图,回答(1)~(4)小题。
平面直角坐标系中,以点P(0,1)为中心,把点A(5,1)逆时针旋转90°,得到点B,则点B的坐标为____.
比100多1的数是99。
—It will be bad weather that we can't go on the picnic.