进入灾害事故现场的所有救援人员，必须根据现场实际情况和危险等级采取（），严格操作规程。
参考答案：防护措施
井下低压安全供电的”三大保护”是指”接地、（）、过电流”保护
A.漏电
B.断接
C.双绝缘
John __ confidence not only from his teacher’s encouraging words but also from his success this time.
A．came up to
B．acquired
C．promote
D．made out
