超声检查时涂抹耦合剂的原因是（）The reason why the coupling agent is applied during ultrasonic examination is that（）

A.降低人体温度Reduce body temperature

B.减少探头移动的阻力Reduce the resistance when the probe moves

C.排除探头和皮肤之间的空气Remove air between the probe and skin

D.消毒Disinfect

正确答案：排除探头和皮肤之间的空气Remove air between the probe and skin