卤代烷管网灭火系统的启动方式有（）。
A.自动控制
B.手动控制
C.机械应急操作
D.消防控制室的控制设备控制
参考答案：A, B, C
— When will the 70th anniversary ceremony for our school ________? All the students and
teachers are waiting for it.
— Well, in my opinion, at 9 am.[ ]
A. happen
B. take place
C. break out
D. occur
痉挛肌电刺激疗法的频率和波宽分别为（）。
A.频率0.66～1Hz，波宽0.1～0.5ms
B.频率1～100Hz，波宽0.1～1ms
C.频率0.66～1Hz，波宽0.01～0.2ms
D.频率0.66～1Hz，波宽0.1～1ms
E.频率2～160Hz，波宽0.1～1ms
