贯穿螺栓安装时，要求螺栓与螺栓孔同心，螺母不能偏斜，这主要是防止贯穿螺栓受到( )。
A.附加拉应力
B.附加压应力
C.附加剪切应力
D.附加弯曲应力
A.先上紧贯穿螺栓后上紧撑杆螺栓
B.先上紧撑杆螺栓后上紧贯穿螺栓
C.撑杆螺栓和贯穿螺栓同时上紧
D.任意
A.前者是将螺栓拉长，而后者是将螺栓压缩
B.前者是将螺栓压缩，而后者是将螺栓拉长
C.两者都是将螺栓压缩
D.两者都是将螺栓拉长
A.扭切应力
B.拉应力
C.扭切应力和拉应力
D.扭切应力或拉应力
高强螺栓连接施工的主要检验项目包括：螺栓实物最小荷载检验以及( )。
A.扭剪型高强度螺栓连接副预应力复验
B.高强度螺栓连接副扭矩检验
C.高强度大六角头螺栓连接副扭矩系数复验
D.高强度螺栓连接摩擦面的抗滑系数检验
E.高强度螺栓抗拉强度验算
轮机英语题库中旳生词摘自轮机英语考证指南上拱 hog下拱 sag地脚螺栓 holding down bolt摆动 swing滑块 slipper机架 entablature/column半组合式 semi-built整体锻造 solid forged过盈 crush滑动轴承 sliding bearing圈簧 coil spring薄层 flash避让坑 cut-out portion定位销 dowel pin剪力/弯曲应力/扭应力 shear/bend/torsion stress卡舌 tag公差 tolerance压缩片compression plate冲程系数 stoke coefficient热效率 thermal efficiency撑杆螺栓 jack bolt锥形螺栓 tap bolt防火罩 flame screen量油尺 dipsticks固定部件 stationary part动能 kinetic energy阀壳 valve cage静/动平衡 statically/dynamic balance松孔镀铬 porous chromium端板 end plate硬质合金钢 hard alloy steel滚花 knurling热障 heat dam喷射震荡油冷却 jet-shaker oil cooling管束 bundle喷油器针阀 fuel valve spindle沉淀柜 settling tank缓冲平衡柜（集油柜）buffer/balance tank齿轮齿条装置 rack and pinion rack滚轮 follower发热值 calorific value柔性非金属管 flexible nonmetallic hose穿透 penetration不锈钢 stainless steel止回阀 check valve螺旋槽 helix回油孔 spill port脉动泵 jerk pump双联压力表 duplex pressure gauge 恒温蒸汽减压阀 thermostatic steam pressure reducing valve分散 dispersion差压式针阀 differential needle valve硫 sulfur 矾 vanadium钙 calcium气化 gasification钠 sodium挥发 volatility波动 fluctuate温度计 thermometer增压器喘振 turbocharger stall石灰石 lime咬死 stuck气动阀件 pneumatic valve启动空气瓶 air starting container碳化 carbonization电磁控制旳空气起动阀 a solenoid operated air Start valve镀锌 galvanized硝酸钠 sodium nitrite中和 neutralized静压润滑 hydrostatic lubrication多歧管路 multiple pipe千瓦 kilowatt消音 muffle 十字头轴承 wristpin bearing摆动运动 oscillating motion划伤 scuffing正向油流 positive flow凝结 coagulation扩压器 diffuser分别 respectively油孔 orifice停车 stall咬缸 seizure油漆剥落 paint blistering更换 withdraw截止阀 stop valve避免 preclude通风 ventilation过盈 nip/crush浸渍污物 impregnated dirt刮痕 scratch共振 resonant主冷却系统 primary cooling system超速保护装置 over-speed trip干式火花消除器 a dry-type spark arrestor内六角扳手 inside hexagonal spanner扭力扳手 torque wrench套筒扳手 socket/box spanner棘轮扳手 ratchet wrench双头开口扳手 double open end wrench梅花扳手 double off set ring spanner冲
Persistent knocking in one cylinder of an eight cylinder diesel engine would MOST likely be caused by______.
A.using fuel oil with low cetane number
B.a badly worn piston pin
C.a loose flywheel key
D.a loose bed plate bolt
Safety shackles are fitted with ______．
A.a threaded bolt
B.a round pin，with a cotter pin
C.a threaded bolt，locknuts，and cotter pins
D.round pins and locknuts
When a vessel is stationary and in a hogging condition，the main deck is under ______．
A.Compression stress
B.Tension stress
C.Shear stress
D.Racking stress
If wire rope clips are used to make a joint in a wire lashing，be sure that ______．
A.the saddle portion of the clip should be applied to the live load segment and the U-bolt to the dead or shortened end segment
B.the saddle portion and the U-bolt of the clip should be applied to the dead or shortened end
C.neither the saddle portion nor the U-bolt of the clip should be applied to the live load segment
D.the U-bolt of the clip should be applied to the live load segment and the saddle portion to the dead or shortened end segment
关于柴油机主轴承采用撑杆螺栓结构，下列说法不正确的是（）