First aid treatment for small cuts and open wounds is to（）.

A.lay the patient down and cover the wound when the bleeding stops

B.stop the bleeding，clean，medicate，and cover the wound

C.apply an ice pack to the wound and cover it when the bleeding stops

D.apply a hot towel to purge the wound，then medicate and cover it

IC在线测试仪的特点是（）。

A.能够对焊接在电路板上的芯片直接进行测试

B.只能检查电路板，不能检查芯片

C.能估计脉冲的占空比和频率范围

D.能够判断输出的脉冲是连续的还是单个的