对高压弯头和管线进行探伤时,其最小充许壁厚是()mm。 ["7","9","11","13"]
正确的救护触电者的具体方法是() ["关闭电源","挑开电线","切断电路","拉开触电者"]
最低设备清单中的符号“M”表示(). ["需要飞行后特殊的维护步骤","需要飞行前特殊的维护步骤","可以失效的机械部件","不可以失效的机械部件"]
Service Connect Message消息通过()信道传送 ["前向业务","反向业务","反向接入","寻呼"]
高压旋塞阀按标志牌指示方向开关,阀芯随手轮转动,旋转()度,手轮就达到全开或全关的目的。 ["30","60","90","120"]
海水的颜色实际是()