时限过电流保护的动作时限是按（）选择的。
参考答案：阶梯原则
被视为治疗麻疹良药的是( )
A．君山银针
B．白毫银针
C．白牡丹
D．大红袍
He _____ the things in the old case which he wanted to keep.[ ]
A. left aside
B. set aside
C. tested out
D. turned around
