干燥塔循环酸浓控制指标为（）A、93～96% B、93.5～95.5% C、94.5～9

下列术后并发症中，较常见的是（）。

A.坠积性肺炎

B.肺栓塞

C.肺不张

D.伤口裂开

E.应激性溃疡

______ they live in the same house, we would no trouble finding them.

---But as traveling salesmen as well as seasonal herdsmen and farmhands, as you know, they move house _______ many of the Americans who live on wheels.

A．As far as; as often as

B．As well as; as well as

C．As long as;;as often as 　　　

D．As long as ; as far as

桩基础内基桩的布置应根据荷载大小、地基土质和（）等决定。

A.桩径大小

B.地形条件

C.基桩所使用的材料

D.基桩承载力

"内燥"病变，多见于（）

A.肺、肾、三焦

B.肺、脾、肾

C.肺、胃、大肠

D.肝、胃、大肠

E.肺、胃、三焦

公钥和私钥的作用是什么？