用一句话概括下面这则新闻的主要内容(不超过15个字)(4分) 备受关注的第十一届中国西部国际博览会昨日(10月26日)在蓉落下帷幕,本届西博
下列物质的水溶液因水解而呈酸性的是 A.NaHSO4 B.AgNO3 C.H2CO3 D.KCl
双羟基铝碳酸钠是医疗上常用的一种抑酸剂,其化学式是NaAl(OH)2CO。关于该物质的说法正确的是( ) A. 该物质属于两性氢氧化物
If a friend snaps at you or is unfriendly, step back, and with a sense of compassion, try to experience life from his____. A. perspective B.priority C.priv
More and more teachers tend to think that teaching is really a job, so they have to devote a lot to it. A. rewarding B. blessing C. demanding
以下对细胞凋亡说法错误的有( ) A.人的胚胎发育过程,细胞代谢旺盛,没有细胞凋亡 B.细胞凋亡是正常生理性的、主动性的细胞死亡 C.花
下列说法正确的是 A.H2O 的摩尔质量是 18 g B.常温常压下,16 g CH4 含有10 mol e- C.常温常压下,11.2 L Cl2 所含的分子数为 3.01×1023 D.将5.85 g NaCl 溶于1 L
This schoolbag is not expensive. And the price of it is the of the three. A. lowest B. biggest C. highest D. smallest