胎儿宫内窘迫时，哪项临床表现有意义

A．臀位破水时，羊水中混有胎便

B．宫缩时胎心120次/分

C．宫缩间歇时胎心为120～160次/分

D．胎心先快后慢，胎动频繁后减慢

E．仅1次胎心在120次/分以下

In case of emergency, whether knowing how to apply first aid or not really ________ in matters concerning wounds like swollen wrists, broken arms, burns, cuts, and so on.

A．makes difference

B．makes a difference

C．makes differences

D．makes different