执行代码m[-c("poor","excellent","good","poor") ] patient[-factor(m) ] patient后,patient的因子水平下列说法正确的是( )
A: poor good excellent
B: poor excellent good poor
C: excellent good poor
D: 以上都不对
A: poor good excellent
B: poor excellent good poor
C: excellent good poor
D: 以上都不对
C
举一反三
- 执行代码m[-c("poor","excellent","good","poor") ] patient[-factor(m,order=TRUE,levels=c("poor","good","excellent"))) ] patient后,patient的因子水平下列说法正确的是( ) A: poor good excellent B: poor excellent good C: excellent good poor D: 以上都不对
- If your English is neither very good nor very bad, which of the following word is the best one to describe it? A: excellent B: superb C: fair D: poor
- The good service at the hotel made up for the poor food to some ( ). The good service at the hotel made up for the poor food to some ( ).
- The properties of cast irons are as follows except . A: good castability B: poor mechanical properties C: good abrasion resistance D: poor machinability
- The good service of the restaurant ( ) the poor food to some extent.
内容
- 0
Being poor, these children are less __________ to go to college or get a good job.
- 1
I've been in ______ health for months and feel very fit. A: poor B: good
- 2
Which one in the following cannot be a good reason for making a complaint? A: poor quality B: good after-sale service C: delayed delivery
- 3
Without enough sleep, people would be ______. A) in poor health C) physically energetic B) in good health D) mentally energetic A: Without enough sleep, people would be ______. B: in poor health C: in good health D: physically energetic E: mentally energetic
- 4
When buying birthday presents, I find my idea is ______. A: poor B: good C: rich