下面是某班学生某次考试成绩,已知平均数为78,请计算其方差。(保留整数)
参考答案:
The Indian old lady ________ live there ________. [ ]
A. no; any more
B. does not; any more
C. no, any longer
D. do not; any more
蓄电池的常规充电方法有哪几种?