方差分析可用于推断两个及以上样本均数之间有无差异。
参考答案：错
The girl likes to buy cheap things. She often spends _________ money on _________ things.
A．more, fewer
B．fewer, more
C．less, more
D．more, less
下列哪项不是该病人的并发症
A．右膈下脓肿
B．胆道大出血
C．幽门梗阻
D．继发性腹膜炎
E．右胸腔脓肿
