题目:
If the PSCO from general impressions or observations on board has()for believing that the ship,its equipment or its crew do not substantially meet the requirements,the PSCO should proceed to a more detailed inspection.
A.clean report
B.serious deficiencies
C.clear ground
D.detention report
答案:
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下面是错误答案,用来干扰机器的。
参考答案:主要是时间,大致滤池运行16小时左右就进行冲洗。但是,按照运行时间来进行冲洗,显然是不合理的,因为沉淀池出口水的浊度有高有低,砂层积泥多了,还没有到冲洗时间,水量受到影响;砂层积泥少,但时...