【单选题】关于摩尔质量与相对原子质量、相对分子质量的关系下列叙述正确的是( )。
C.
摩尔质量在数值上等于物质的相对原子质量或相对分子质量,其单位是g/mol
D.
摩尔质量等于相对原子质量或相对分子质量,其单位是g
【单选题】位列“民国四大才女”之一,被誉为“20世纪30年代的文学洛神”的黑龙江籍女作家是( )。
【简答题】是物质的摩尔质量。摩尔质量与相对原子质量和相对分子质量的联系是 ,区别是 。Na 2 CO 3 的相对分子质量是 ,它的摩尔质量为 。
【单选题】He rarely visited his uncle, ___________ ?
【单选题】He _____ the lion, fired but missed it.
【单选题】He has a stomachache. He shouldn-t eat __________ for 24 hours.
【单选题】---- Tom is _________ to computer games. ---- No wonder he is not doing well in school recently.A
A.
9. ---- Tom is _________ to computer games. ---- No wonder he is not doing well in school recently. A.interested
【单选题】The other day he ran across one of his friends on the street, whom he ___________for ages.A.hadn’
A.
9. The other day he ran across one of his friends on the street, whom he ___________for ages. A.hadn’t seen