单项选择题
The C02 flooding system is actuated by a sequence of steps which are（）.
A.break glass，pull valve，break glass，pull cylinder control B.sound evacuation alarm，pull handle C.open bypass valve，break glass，pull handle D.open stop valve，open control valve，trip alarm
单项选择题 The bypass valve on a self-contained breathing device should be opened if（）.
单项选择题 The boat is stowed on the davit rather than on a cradle with which type of davit?（）
单项选择题 Static electricity may be built up by the（）.
