A:浓硫酸和浓硝酸都不能用来直接跟锌粒反应制氢气
B:浓硫酸和浓硝酸都能与金属铜反应
C:浓硫酸和浓硝酸加水稀释后都能与金属铜反应
D:浓硫酸和浓硝酸在常温下都能用金属铝或铁制容器盛放
Time of the accident
Last week.
Place of the accident
On my way to Li Ming's ____.
Reason and result of the accident
I rode too ____. My bike hit a big tree. I was in a lot of ____.
Aid
A passerby ____ me to the ____.
默写① ,拾此充饥肠。(白居易《观刈麦》)② ,衡阳雁去无留意。(范仲淹《渔家傲·秋思》)③ , ,欲与天公试比高。(***《沁园春·雪》)④ ,左右流之。窈窕淑女, 。(《关雎》)⑤大漠孤烟直, 。(《使至塞上》)⑥ ,古来征战几人回?(《凉州词》)
x2+4x+2=0