【单选题】数据结构的逻辑结构被形式化地定义为一个二元组( D,S),其中D是 ( 1 )的有限集合, S是D上( 2 )的有限集合。
【简答题】____________是设置在轿厢入口的门,是设在轿厢靠近层门的一侧,供司机、乘客和货物的进出。
【单选题】Which of the following is best, when speaking with a 3 y.o. child?
A.
“We are going to perform an esophagogastroduodenoscopy.”
B.
“This machine will be noisy; would you like to listen to some music?”
C.
“You need to be NPO for your procedure in the morning.”
D.
“Everything is going to be fine—you should not be afraid.”
【单选题】轿厢安全窗是设置在轿厢顶部向外开启的封闭窗,主要供:().
【判断题】导靴是设置在轿厢和对重装置上,使轿厢和对重沿各自导轨运行的装置。
【判断题】轿门是设置在轿厢入口处的门。一般的电梯都装有自动开关门机构,自动开关门机构设在轿门的上方。