On notification by Admiralty Notice to Mariners that a new edition of one of the books，or a new supplement to one，has been published，it should be obtained（）. ["as soon as possible","prior to its publication","in advance of any possible accident","by means of other than airmail"]
酸浴循环泵的正确操作十分重要，如果操作不良，往往造成（），影响生产。 ["设备损坏","上酸不畅","流量低","扬程不够"]
写出各型船首、船尾的名称及具体应用场合。
写出下图的名称及具体应用场合。
导线在各个工序间料件周转时，需要加强保护，如内部线束、电气设备、转向架预配线及底架线槽运输过程中必须进行保护，对各种（）及未压接端子的线端部需加以保护，防止损伤连接器及导线。 ["A.连接器、端子","B.端子","C.导线","D.连接器"]
The over-speed trip installed on most diesel engine will stop the engine by shutting off the （） ["water supply","fuel oil supply","lube oil supply","exhaust damper"]
什么是粉煤灰的脱硅效率？
