当进入封闭舱室人员发生危险无法自救时,守护人员不应().
A. 立即报警
B. 加强通风
C. 立即进舱救人
D. B+C
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立位X线检查可见两侧膈下有弧形或半月形透亮气体影的是()
A. 胃肠穿孔
B. 肠梗阻
C. 溃疡性结肠炎
D. 结肠癌
E. 消化性溃疡
在Fe-Fe3C相图中,共晶转变温度是(),共析转变温度是()。
Select the three best answers which best describe Private Network-to Network Interface (PNNI) in an ATM network.()
A. It is the Routing protocol used between ATM switches
B. PNNI uses the same Dijsktra algorithm for SPF calculation
C. PNNI and OSPF use the same Database to make cohesive decision for packet forwarding
D. PNNI measures line capacities and delays in addition to simple cost metric