[单选题]水润滑艉轴承的轴承衬套材料选用（）。A . 铸铁B . 铸钢C . 锻钢D . 铸铜
[单选题]桦木层压胶木是铁梨木的代用材料，具有材质致密、坚硬、耐热、绝缘性好、成材率高，缺点是（）。Ⅰ.耐磨性差；Ⅱ.耐蚀性差；Ⅲ.耐水浸性差；Ⅳ.刚性差；Ⅴ.脆性大。A . Ⅱ＋ⅢB . Ⅰ＋ⅤC . Ⅱ＋ⅤD . Ⅱ＋Ⅳ
[单选题]In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.A . increase its qualityB . obtain complete burningC . reduce its weightD . all of the above
[单选题]Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.A . deflectionB . discrepancyC . errorD . tolerance
[单选题]传动轴系若带有减速装置，推力轴承应置于（）。A . 飞轮之前B . 曲轴箱内C . 尾轴轴端D . 减速齿轮箱内
[单选题]Emulsion oils and sodium nitrite are both approved additives, but （） cannot be used if any pipes are galvanized or if soldered joints exist.A . the latterB . latterC . formerD . the former
[单选题]水润滑艉轴承的长度应不小于（）倍的艉轴直径。A . 2B . 3C . 4D . 5
[单选题]If the needle valve in a fuel injection nozzle sticks open （）.A . no fuel will be delivered through the nozzleB . the nozzle will overheat and crackC . time of injection will changeD . fuel will leak into the drain line
[单选题]小型船舶的螺旋桨直径D＜1.5m时，螺旋桨和艉轴允许采用（）方式连接。A . 有键环氧树脂B . 无键环氧树脂C . 机械连接D . 油压套合连接
[单选题]Expansion tank should be used to remove （） from cooling water.A . scaleB . sludgeC . chemicalsD . air
[单选题]If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.A . low compressionB . failure of the fuel pump to discharge fuelC . incorrect timing of fuel pumpD . turning gear being still o
[单选题]艉轴管装置是用以（）、密封船体不使海水进入艉轴承和防止润滑油溢出的设备。A . 构成艉轴承B . 构成轴系C . 支承艉轴和螺旋桨D . 支承艉轴衬套
[单选题]更换艉轴铜套的极限厚度为（）。A . 0.02d＋5mmB . 0.015d＋3.5mmC . 0.03d＋7.5mmD . 0.01d＋2mm
[单选题]Diesel oil may be used to cool （） of a diesel engine.A . cylindersB . exhaust valvesC . pistonsD . fuel valve
[单选题]Before starting the turning gear, （） should be worked by hand to minimize corrosive action on the liners.A . the indicatorsB . the starting valvesC . the cylinder lubricatorsD . the turning gear
[单选题]沿海及内河的船舶的螺旋桨直径D＜4.5m时，螺旋桨和艉轴允许采用（）方式连接。A . 无键环氧树脂B . 有键环氧树脂C . 机械连接D . 油压套合连接
[单选题]对短轴系轴线校中理解错误的是（）。A . 刚惟好B . 挠度小C . 对轴系偏差敏感D . 对轴系偏差不敏感
[单选题]水润滑艉轴铜套过度磨损可（）修复。A . 光车B . 堆焊C . 喷焊D . 更换
[单选题]Compressed air is supplied by air compression to （）.A . the air receiversB . the starting valvesC . the cylinder coversD . the distributor
[单选题]During the inspection, the starting air valves should be closed （） the engine from turning.A . to increaseB . to speed upC . to preventD . to reduce
[单选题]In order to ensure the safety of the ship and its equipment during UMS operation, certain essential functions （）.A . must be providedB . may be providedC . have providedD . can be provided
[单选题]If the atomizer holes are enlarged beyond the makers recommended size, the atomizer must be （）.A . repairedB . replacedC . replenishedD . repeated
[单选题]For an ordinary four-stroke engine the exhaust valves open （）.A . after TDCB . before TDCC . after BDCD . before BDC
[单选题]关于螺旋桨轴的连接方式，下列说法不正确的是（）。A .键连接键槽应力集中严重B .胶黏剂连接适于D＜4.5m的沿海及内河船舶C .D＜1.5m的小型船舶可直接采用胶黏剂连接D .油压无键套合连接的桨锥孔与轴锥配合不必刮研
[单选题]艉轴防蚀衬套磨损后，除采用光车修复外，还可采用（）。A .焊补B .修磨C .改变橡胶环的轴向位置D .改变防蚀衬套轴向位置
[单选题]Exhaust temperature increases in all cylinders, the possible cause may be（）(1) increased scavenging air temperature(2) air in fuel pumps and fuel valves(3) fouling of air and gas passagesA . (1)+(2)B . (1)+(3)C . (2)+(3)D . (1)+(2)+(3)
[单选题]Each crank is made up of two crank webs joined by a common（） to which the bottom endbearing is fitted.A . throwB . crankshaftC . crankpinD . crosshead
[单选题]铁梨木尾轴后轴承的长度不应（）。A . 小于尾轴轴颈的2，5倍B . 大于尾轴轴颈的2.5倍C . 小于尾轴轴颈的4倍D . 大于尾轴轴颈的4倍
[单选题]带有普通键槽的双螺旋桨轴或艉轴其检验间隔期为（）。A . 1年B . 2年C . 3年D . 4年
[单选题]艉轴管本件在船上安装后应进行（）水密试验。A . 艉轴管B . 尾尖舱C . 艉轴承D . 货舱