【单选题】听力原文:W: When did you become interested in collecting stamps? M: Oh, when I was about ten years old. It's an exciting hobby. You know, the first postage stamps were issued in Britain in 1840. W: Really...
A.
A picture of the British coat of arms.
B.
A picture of the queen's palace.
C.
A picture of Rowland Hill.
D.
A picture of Queen Victoria.
【简答题】法兰连接应保持同轴度,其螺栓孔中心偏差一般不超过孔径的5%,并保证螺栓的()。
【单选题】听力原文:W: When did you become interested in collecting stamps? M: Oh, when I was about ten years old. It's an exciting hobby. You know, the first postage stamps were issued in Britain in 1840. W: Really...
A.
A picture of the British coat of arms.
B.
A picture of the queen's palace.
C.
A picture of Rowland Hill.
D.
A picture of Queen Victoria.
【单选题】管道法兰连接时,应保持同轴,其螺栓孔中心偏差一般不超过孔径的()。
【单选题】导游在拒绝个别游客提出因太累想安排点额外的夜间娱乐活动时说道:“您的意见很好,客人也 都比较累,但许多人还有其他的计划,最好还是让大家自行安排,而且明天还有很长的行程要走.”导游的这种拒绝方法属于( ).
【单选题】导游在拒绝游客提出因太累想安排点额外的夜间游乐活动时说道“您的意见很好,客人也都比较累,但许多人还有其他的计划,最好还是让大家自行安排,而且明天还有很长的行程要走”,导游的这种拒绝方法属于 ( ) 。
【单选题】.法兰与管子焊接后,两片法兰连接其螺栓孔中心偏差一般不超过孔径的( ),使螺栓能自由穿入。
【单选题】法兰连接时应保持同轴,其螺栓孔中心偏差一般不超过孔径的(),并保证螺栓自由穿入。