化脓性感染形成脓肿后，外科治疗的基本原则是

A．立即切开引流

B．配合局部物理治疗

C．加大局部抗生素用量

D．加用肾上腺皮质激素

E．全身应用广谱抗生素

We have already said a good deal about the various problems _______ the war.

A．trying out

B．dating back to

C．appealing to

D．relating to