— ________. I have another one at home.
A:It doesn't matter
B:You're welcome.
C:My pleasure
D:It's too bad
小梅同学把同一支压强计的金属盒先后放入甲、乙两种液体中的同一深度,压强计两管中的液面高度差如图所示,两种液体的密度ρ甲<ρ乙,由此实验现象可得结论为:____ .
下列各组转化中,一定条件下均能一步实现的组合是( )