设x1，x2，…xn是来自总体N（μ，σ^2）的样本，μ，σ^2未知，<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23819848_0.png"><img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23819848_0_1.png">则检验假设H0∶μ＝0时应选取的统计量是（　　）。