爆破地点（）m以内，矿车、未清除的煤、矸或其它物体堵塞巷道断面（）以上，严禁装药爆破。
参考答案：20、1/3
She was so angry at all ______ I was doing ______ she walked out.
A．that; which
B．that; that
C．which; that
D．which; as to
二次侧电流为5A的单相电流互感器额定容量为25VA，则额定阻抗为（）。
A.5W；
B.1W；
C.25W；
D.10W。
