【简答题】在PTN的PWE3技术中,用到了两层标签, 标识Tunnel, 用来标识PW。
【简答题】本金1万元,每年10%的收益,计算其10年,20年,30年后的数额。
【单选题】The most common cause of scale formation in an auxiliary boiler is _____.
A.
concentrations of calcium sulfate in the boiler water
B.
fuel oil in the feed water
C.
improper treatment of the feed water with calcium sulfate
D.
excessive feed water alkalinity
【单选题】When did radio come into the common American household in a large scale?
B.
In the middle of 1920s.
C.
By the middle of 1930s.
【单选题】北京市地方标准DB11/418《电梯日常维护保养规则》中规定,电梯安全管理人员、电梯日常维护保养作业人员、应当按照( )有关规定经特种设备安全监督管理部门考核合格,取得( )统一格式的特种作业人员证书,方可从事相应的作业或者管理工作。
【单选题】What type of scale is this?
B.
werful —:—:—:—:-X-:—:—: Weak
C.
reliable —:—:—:—:—:-X-:—: Reliable
E.
semantic differential scale
F.
continuous rating scale