【判断题】在数据库的三级模式体系结构中,模式与内模式之间的映象(模式/内模式),实现了数据的逻辑独立性。
【多选题】I/O设备一般由下列哪些部分组成?( )
【判断题】对被查封、扣押的财产,执行员必须造具清单,由在场人签名或盖章后,交给被执行人一份,被执行人是公民的也可以交给他的成年家属一份。()
【简答题】Bob is happy. He is at a new school, and the other students are friendly.“Hi, Bob!” they say. But some students say,“Hi, Peter!” Bob doesn't understand. He asks another student, "why do some students ...
【判断题】The term “peer review” suggests that we can discuss with our classmates about our academic papers.
【单选题】-Look! Is that Peter? - No, it's Jack. Peter is _________ than Jack
【简答题】波长为600nm的单色光垂直入射在一光栅上,第二、第三级主极大明纹分别出现在sinθ=0.2及sinθ=0.3处,第四级缺级,求: (1)光栅常数; (2)光栅上狭缝的宽度; (3)屏上一共能观察到多少根主极大明纹?
【判断题】采摘机器人作业空间狭小紧凑,作业对象及障碍物随机分布。采摘机械臂运动过程中其末端姿态能够随作业工序不断调整,对于果实可靠夹持、避免障干涉以及保证作业效率都具有重要意义。