A:标准状况下,5LCH4气体与5LNH3气体的原子个数之比为5:4
B:常温常压下,11.2LO3中所含氧原子个数大于1.5NA
C:同温、同压下,相同体积的N2和CO气体具有相同的分子数和相同的密度
D:同温、同压下,等质量的一氧化碳和二氧化碳的密度比为7:11
东西半球的分界线是( )
在安吉的天荒坪旅游区内有一棵70年高龄的古树,它粗大的树干上有一个树洞,洞内有积水、昆虫、蕈类、细菌等,这里所叙述的是一个( )
A.I have dinner at home.
B.I like fish best.
C.I'd like a sandwich.
D.I have beef noodles.
E.Because it's healthy.
⑴What's your favourite food? ____
⑵What would you like? ____
⑶What do you have for lunch? ____
⑷Why do you like it? ____
⑸Where do you have dinner? ____
下列现象属于太阳活动对地球产生影响的是( )