【单选题】Public transit. In North America, public transportation has been the major casualty of the commitment to the automobile. Ridership on public transportation declined in the United States from 23 billio...
A.
Commuter railroad service, trolleys and buses have been reduced in the U. S.
B.
Subways have largely been maintained.
C.
Fares usually can not cover operating costs.
D.
U.S. officials think it worthwhile to subsidize public transportation.
【单选题】自动准同步并列一般由:等基本部分组成。
A.
断开信号控制单元、频差控制单元、电压差控制单元
C.
合闸信号控制单元、频差控制单元、电压差控制单元
【简答题】判断下段文字使用了哪种生理感受类型? 屋顶花园里常常有孩子们溜冰,兴致高的时候,从早到晚在我们头上菇滋菇滋挫过来又挫过去,像瓷器的摩擦,又像睡熟的人在那里磨牙,听得我们一粒粒牙齿在牙龈里发出酸如同青石榴的子,剔一剔便会掉下来。
【判断题】1946年,Helm和Trolle建立并完善了“区别检验法”。
【单选题】在服务开发的设计和再设计阶段,( )最为有用。