print(frame['height'].resample('M', kind='period').mean())写成分组的方法中，错误的是： A: print(frame['height'].groupby(frame.index.dt.month).mean()) B: print(frame['height'].groupby(frame.index.month).mean()) C: print(frame['height'].groupby(frame.index.to_period(freq='M')).mean()) D: print(frame.groupby(frame.index.to_period(freq='M'))['height'].mean())

print(frame['height'].resample('M', kind='period').mean())写成分组的方法中，错误的是： A: print(frame['height'].groupby(frame.index.dt.month).mean()) B: print(frame['height'].groupby(frame.index.month).mean()) C: print(frame['height'].groupby(frame.index.to_period(freq='M')).mean()) D: print(frame.groupby(frame.index.to_period(freq='M'))['height'].mean())

The arithmetic average index is obtained by weighted average using the individual index of the quantity indicator and the value index of the base period as the weight. ()

The reason for the high potato harvest index is the long potato setting period

以下各题，选项“二选一”12， A mutual fund manager would use index futures. He or she would________ futures contracts on a stock index, therefore reducing any downside risk for a certain period of time. (long/short )

The clinical stage of vitamin D deficiency rickets is A: Early period, middle period, late period B: Initial period, peak period, recovery period C: Early stage, acute period, recovery period, sequelae period D: none of the above

If 2003 is the reference base period, what is the price index for the CPI basket of goods for 2011 in the above table? A: 97.3 B: 102.8 C: 128.0 D: zero because the price of CDs fell and the price of water increased

10.Consult _____ for questions about earthquakes.　　a. the six index b. index six c. sixth index d. index numbering six A: the six index B: index six C: sixth index D: index numbering six

When is our English class every week A: Period 1-2 Monday; Period 3-5 Wednesday B: Period 3-5 Monday; Period 8-9 Thursday C: Period 8-9 Monday; Period 3-5 Thursday D: Period 1-2 Monday; Period 3-5 Thursday

An animation of a small ball falling, we will record the beginning and end of the ball movement as____. A: key frame B: subdivision frame C: transition frame D: intermediate frame