在反应堆物理实验室里是否用三氟化硼正比计数管和氦－３正比计数管来探测中子。
参考答案：对
上行感染引起的急性肾盂肾炎，细菌最先侵犯（）
A．肾皮质
B．肾髓质
C．肾间质
D．肾盂
E．肾盏
As is reported, it won't take a long time ____ the 20th Golden Rooster and Hundred Flowers Film Festival falls in the Binhu New Area. Hefei.
A．since
B．when
C．before
D．that
