【多选题】多选) 群体型生活的固着型纤毛虫有( )。
【单选题】两台发电机并联运行,若某台发电机燃油供油系统故障停止供油,可能引起另一台发电机______保护。
【简答题】请阐述数据准备、数据选择、数据预处理、数据减缩、数据挖掘、模式解释、知识评价各个阶段所做的工作。
【判断题】线性规划如果有最优解,则它一定会出现在可行域的边缘上。()
【单选题】Which of the following events could shift the demand curve for gasoline to the left?
A.
The income of gasoline buyers rises, and gasoline is a normal good.
B.
The income of gasoline buyers falls, and gasoline is an inferior good.
C.
Public service announcements run on television encourage people to walk or ride bicycles instead of driving cars.
D.
The price of gasoline rises.
【简答题】Downloaded programs are often zipped to reduce download times, and they have to be ____________________ before the installation can proceed.