A:2n5m
B:2m5n
C:n5m
D:m5n
用显微镜观察时,如果转动目镜和物镜都未能把视野中的污点移走,那么可以断定污点在( )
一 She wears a pink skirt today.
一 Yes. beautiful she looks! The skirt is made silk.
下列过程中,吸收热量的是( )
6.43﹣6.2﹣0.2=0.03。( )