露出水面3米的冰山,雷达探测到该冰山的距离大约为()海里。 ["A.4.0","B.3.0","C.2.0","D.1.0"]
不属于PDH系列的接口类型是:() ["A、2M","B、8M","C、34M","D、155M"]
过热器疏水阀有什么作用?
SDH的中文解释是:() ["A、准同步数字系列","B、同步数字系列","C、准同步模拟系列","D、同步模拟系列"]
在晴朗的白天,大冰山视距可达:() ["A.10海里","B.15海里","C.20海里","D.25海里"]
锅炉空气阀起什么作用?