如发盘元规定的有效期,则受盘人可在任何时间内表示接受。()
A. 正确
B. 错误
有一研究为完全随机取样设计,需检验两组平均数是否存在显著差异,已知其分布为正态,n>30,最合适的统计方法是()
A. 符号检验
B. 秩和检验
C. T检验
D. x2检验
"That English fellow's songs are very poetic. " "______the words to the songs, but he also
A. He also writes
B. Although he writes
C. Not only does he write
D. It is not all that he writes
假设1991年我国原木产量为1000万吨,那么人造板产量为多少吨?
A. 4吨
B. 40吨
C. 25吨
D. 250吨