巧问善诱就是掌握谈判中的（）技巧，顺着事情发展的趋势加以引导，引导对方认可己方的观点。
参考答案：提问
—You haven’t got the textbook for my chemistry yet.
—I know, and we ________ to get it for the last five weeks.
A．will have been trying
B．have been trying
C．will be trying
D．had tried
完全随机设计的多个样本均数比较，经方差分析，若P≤a，则结论为（）
A.各样本均数全相等
B.各样本均数全不相等
C.至少有两个样本均数不等
D.至少有两个总体均数不等
E.各总体均数全相等
