Each lifeboat must be lowered and mane

1、The cylinder and piston must be warmed

The cylinder and piston must be warmed up （） to a temperature of about 140 degF in standing by engine.ArepeatedlyBquicklyCgraduallyDimmediately

2、All dunnage planks and mats must be se

All dunnage planks and mats must be sent to board（）commencement of loading.Aprior toBduringCin the period ofDafterward

3、The lower end of each piston rod is re

The lower end of each piston rod is reduced in diameter to fit a bore in （）, this being secured to the piston rod by a nut.Athe crank-webBthe connecting rodCthe main bearingDthe cross-head

4、Each journal and pin should be examine

Each journal and pin should be examined for （） and grooving.AbridgesBrecessesCrearsDridging

5、“The union must and shall be preserved

“The union must and shall be preserved（联邦必须而且将会得到保留）。”这是林肯1860年参加总统竞选时的主题。他认为当时美国政府面临的首要任务是（）。A实现国家独...

6、Bridge orders must be （） and a record

Bridge orders must be （） and a record of any required changes in speed and direction should be kept.Aslowly carried awayBcarried out with a period of delayCpromptly carried outDpaid by the captai