【单选题】According to the conversation which statement about the name of the White House is True?
A.
It became official before President Theodore Roosevelt had it engraved upon his stationery.
B.
It derives the name from the color of the building.
C.
The building was restored after being burned in 1814, so the smoke - stained gray stone walls were painted white.
D.
Actually the cognomen 'White House' was applied to the building some time before it was painte
【多选题】下货堆叠时,特殊货品如冷冻货品等需要注意的是
【单选题】液压系统工作时的环境温度较高时,宜选用 ( )
【单选题】问题解决的过程大致可以划分为五个阶段,其中首先要做的是( )
【单选题】—_____she come this afternoon? —No, she can't. Because her mother is ill. [ ]
【单选题】She will have to find somewhere else to work, for she can't ______ this loud noise any longer.
【简答题】液压系统的油温较高或环境温度较高,宜选用()的液压油。
【单选题】液压系统工作压力较高时,宜选用黏度( )的油液;环境温度时,应采用黏度较低的油液。
【单选题】当机床液压系统工作压力较高时,环境温度较高时,适宜选用()黏度的液压油。
【单选题】液压系统所处环境温度较高时,应选择粘度( )的液压油。