With strong __________ to go to Tsinghua University, he is working very hard.
A:dream
B:determination
C:attitude
D:quality
如图是中心法则示意图,各个字母代表不同的过程,相关叙述正确的是( )
家庭日常生活中经常用到的下列物质中,属于纯净物的是 ( )