— Two kilos, I think.
A:How many
B:How often
C:How long
D:How much
- Do you like listening to Zhang Jie's songs _________ are very loud and full of energy?
- Of course! I'm his fan.
史料大致可以分为两类:一是直接的史料;二是间接的史料。凡是未经中间人手修改或转写的,是直接的史料;凡是已经中间人修改或转写的是间接史料。下列属于直接史料的是
读我国某农村人口年龄结构金字塔图,完成下列问题。
同温同压下,同体积的气体单质X2和气体单质Y2化合生成气体Z,且反应前后气体体积不变,则Z的化学式为