在燃烧室上部或排管处有人进行工作时，下部采取有效的安全措施时可以进行清扫等交叉作业。

联轴器所联接两轴的相对偏移形式有轴向偏移，（），（）偏移和（）偏移四种。

4.2÷0.15=______÷15，______÷3.6=108÷36．

在堤坝下游采取防治渗透变形的方案时，可采用（）方法。（）

A.铺设压渗盖重（压重）

B.黏土防渗墙

C.排水减压井

D.下游排水体

预防蛛网膜下腔出血患者再出血的最根本措施是（）

A.应用纤维蛋白溶解抑制剂

B.预防脑梗死

C.安静并卧床休息

D.发现动脉瘤并早期手术

E.避免用力排大便

The primary reason for withholding food and fluids from a client who will receive general anesthesia is to help prevent

A．constipation during the immediate postoperative period.

B．vomiting and possible aspiration of vomitus during surgery.

C．pressure on the diaphragm with poor lung expansion during surgery.

D．gas pains and distention during the immediate postoperative period.