机柜顶端红灯亮,此时设备上有()
A.紧急告警
B.主要告警
C.次要告警
D.供电正常
参考答案:A
He ______to swim across the Channel, but they failed because of the terrible weather.
A.succeeded
B.managed
C.attempted
D.thought
二线注射类抗结核药物中,哪种药物耳毒性最小?()
A、阿米卡星
B、卷曲霉素
C、卡那霉素
D、链霉素