Each fireman’s outfit and its spare equipment on a tanker must be stowed in a(n)（）. ["locked cabinet in the machinery space","unlocked cabinet in the machinery space","separate and accessible location","location near a fire hydrant"]
开关站典型操作任务包括的内容和要求有哪些？
The cubic inch(or liter) displacement of a cylinder is determined by the diameter of the piston and the （） ["length of the crankshaft","volume of the clearance space","weight of piston","length of the stroke"]
一般程控交换机的馈电电压是负（）伏。 ["48","12","20","36"]
柱上开关典型操作任务包括的内容和要求有哪些？
锥形交叉卷绕筒子的卷绕特性是什么？
