简述化工设备中化工容器的特点。
参考答案:
①适应化学工艺过程所要求的压力和温度条件;
②承载化学介质的作用;
③要能长期的安全工作;
⑤要保证密封。
夏柯三联征包括()
A.疼痛、发热、黄疸
B.寒战、发热、黄疸
C.疼痛、发热、抽搐
D.疼痛、贫血、黄疸
E.发热、黄疸、休克
All electrical appliances aboard a vessel should be grounded to().
A.prevent them from falling when the vessel rolls
B.protect personnel from electrical shock
C.increase their operating efficiency
D.prevent unauthorized personnel from operating them