单选题铸铁件比难焊,正确的是()。ASP引器焊缝脆性B冷却速度快,焊缝容易形成白口C容易氧化生成CO,焊缝容易产生气孔DA+B+C
单选题
铸铁件比难焊,正确的是()。
A
SP引器焊缝脆性
B
冷却速度快,焊缝容易形成白口
C
容易氧化生成CO,焊缝容易产生气孔
D
A+B+C
参考解析
解析:
暂无解析
相关考题:
单选题All bilge suction must be fitted with suitable (), which in the machinery space would be mud boxes positioned at floor-plate level for easy access.AstrainersBvalvesCelementsDseparators
单选题During extremely cold weather, while starting an engine, it turns too slowly and fails to startThis problem is most likely the result of ()Ahigh fuel oil viscosityBlow fuel oil temperatureChigh lube oil viscosityDenergized glow plugs
单选题The switchboards for a-csystems differ from the d-cswitch gear in that the open type panels are generally() and the dead-front switch gear is the common rule.ApermissiblyBpermissibleCno permissibleDnot permissible
单选题船舶电台除必须具备我国或国外有关主管部门核发的电台执照、通导设备核定表,以及我国自发的内部学习资料和有关文件外,还应具备()国际业务文件。A无线电规则和无线电信号书B无线电定位和特别业务电台表C海岸电台表或相应资料D以上都是
单选题雾中航行,当你听到一长三短的笛号后,可表明来船为:() Ⅰ是一艘被拖带的船舶中的最后一艘 Ⅱ、一艘被拖带的船舶中的最前一艘 Ⅲ、该被拖船上配备有船员 Ⅳ、该被拖船上不配备有船员AⅠ、ⅢBⅡ、ⅣCⅠ、ⅣDⅡ、Ⅲ
单选题空船遇到正横来风顺流抛锚掉头或弯曲水道顺流抛锚掉头时,关于掉头方向下列哪项正确()?A弯曲水道向凸岸一侧掉头,空船遇到正横来风应向上风掉头B弯曲水道向凹岸一侧掉头,空船遇到正横来风应向上风掉头C弯曲水道向凸岸一侧掉头,空船遇到正横来风应向下风掉头D弯曲水道向凹岸一侧掉头,空船遇到正横来风应向下风掉头
单选题A claim for cargo damages may be held against the shipowner if such damage is the result of failure of the ship’s officers to().Aensure the fitness and safety of cargo spacesBensure adequate packaging of the cargoCprevent delays due to quarantine restrictionsDcorrect all defects in the ship's construction
单选题主机遥控系统的主起动逻辑回路中,其起动准备逻辑条件包括()。 ①起动的鉴别逻辑; ②换向的鉴别逻辑; ③制动的鉴别逻辑; ④盘车机脱开; ⑤低于发火转速; ⑥滑油压力正常。A①②⑥B③④⑥C②③⑤D④⑤⑥
单选题() means the level for which minimum appropriate protective security measures shall be maintained at all times, threats and exchanging such information with appropriate Contracting Governments.ASecurity level 1BSecurity level 2CSecurity level 3DLowest safety level
单选题船长120m的甲船,海上拖带132米的乙船,由于乙船为海损船舶,故海上拖航速度较低,估算所需拖缆长度约为:()A252mB378mC428mD504m