【名词&注释】
螺旋桨(propeller)、极限值、活塞环(piston ring)、说明书(specification)、活塞式(piston)
[单选题]修船时,抽出艉轴后立即用湿草包填塞于艉轴承内,这是为了()。
A. 保护艉轴承精度
B. 防止异物损伤轴承
C. 防止铁梨木产生裂纹
D. 防止艉轴承变形
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学习资料:
[单选题]在偶然故障期内,故障是否发生,是()。
A. 可以预测
B. 可以防止
C. 可理论计算
D. 无法预测
[单选题]对筒状活塞式(piston)柴油机,在未装活塞环的条件下,活塞位于近上、下止点位置时,活塞裙部与气缸内孔单边最小间隙应不小于()。
A. 该处总间隙的20%
B. 该处总间隙的25%
C. 说明书规定极限值的20%
D. 说明书规定极限值的25%
[单选题]螺旋桨0.4R以内的缺陷()修理。
A. 可焊补
B. 不可焊补
C. 一般不可焊补
D. 可采用喷焊
[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 latter
B. latter
C. former
D. the former
[单选题]The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the () caused by the friction at the bearings.
A. acids
B. additives
C. heat
D. gear
[单选题]The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to ().
A. assist in a quick cutoff of fuel injection
B. allow oil backflow from the injector to the helix
C. reduce fuel oil pressure between injection strokes
D. meter the quantity of fuel delivered
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