在紧固设备人孔或封头,拧紧螺栓的次序为()。A.依次拧紧 B.间隔拧紧 C.对称拧紧 发布时间:2019-07-11 20:06 │ 来源:www.tikuol.com 题型:单项选择题 问题: 在紧固设备人孔或封头,拧紧螺栓的次序为()。A.依次拧紧B.间隔拧紧C.对称拧紧D.单边拧紧
题型:单项选择题 读句子,选出与句子内容相符的图画,将其标号填在句前括号里。( ) 1. Last Friday, Miss Liu told us about some interesting dinosaurs.A. ( ) 2. I learned how to use reference books in the library.B. ( ) 3. We should turn off the lights when we leave the room.C. ( ) 4. The dress is eight hundred dollars. It's expensive. D. ( ) 5. People are trying to protect these tigers. They live in the northeast of China.E. ( ) 6. Disneyland is one of the greatest theme parks in the world.F. 查看答案
题型:单项选择题 男,76岁。一年来日常活动时即感胸闷,3天前突发夜间阵发性呼吸困难,伴咳粉红泡沫痰。查体:BP100/70mmHG,心尖搏动呈抬举样,胸骨右缘第二肋间可闻及4/6级收缩期喷射样杂音,向颈部传导,双肺可闻及散在细湿啰音。对明确诊断最有帮助的检查是()。A.心电图B.胸部CTC.胸部X线片D.超声心动图E.心电图运动负荷试验 查看答案
题型:单项选择题 对于三点式高压隔离开关,当处于“接地”位置时,如没有限位保护装置,当电场升压时,会出现()。A、电压没有,电流上升较快B、电流没有,电压上升较快C、电压、电流都没有D、电压、电流正常 查看答案