【判断题】She thinks it's good manners to give up one's seat on a bus to an old person.
【单选题】Sometimes matters may result in surprisingly large effects.
【判断题】( ) 4 She thinks it's good manners to give up one's seat on a bus to an old person.
【单选题】测试导入单选题60 KOH的碱性最接近于下列哪一种物质( )
【判断题】用0.1mol/LNaOH溶液滴定100mL0.1mol/L盐酸时,如果滴定误差在±0.1%以内,反应完毕后,溶液的pH范围为4.3~9.7。