装设接地线必须由两人进行。若为单人值班,只允许使用接地(),或使用()合接地刀闸。
参考答案:刀闸接地;绝缘棒
慢性肺心病患者,发生慢性呼吸衰竭月余,间有活动后气短。血气分析:pH7.41,PaO8.66kPa(65mmHg),Sa093%。给氧的原则是()
A.持续低流量、低浓度给氧
B.高浓度给氧
C.间歇给氧
D.不需给氧
E.面罩给氧
I'd like to say something about the canteen service in our school.In general,the service is________(满意).The 1.________hall is clean and tidy.The dishes look inviting and tasted________ as well.What's
more,the workers 2.________there treat us as their friends,________makes us 3.________feel very
happy.However,the________(价格) of 4.________the meals is a little too high.Besides,we can only have
a few dishes to c________from and the canteen is5.________ ________(拥挤).As a result, we often
have to 6.________stand in line for a long time________we can get 7.________the meal. You could
understand what difficulty we________in dealing with the three meals every 8.________day .May I
suggest something________done to 9.________ s________ the problems so that we can all enjoy
10.________our meals at school?