A cast steel strong back is fitted in way of the combustion space to help absorb （）.

[单选题]G．raham-Steel杂音A．二尖瓣狭窄B．主动脉瓣狭窄C．主动脉瓣关闭不全D．三度房室传导阻滞E．肥厚梗阻型心肌病

[单选题]G．aham Steel杂音( )A．房间隔缺损B．室间隔缺损C．两者均有D．两者均无

[名词解释] Graham Steel杂音

[名词解释] CAST

[单选题]Stretchers are fitted in lifeboats to provide a（）.A . place for people to lie downB . means for rigging the sailC . place for rowers to brace their feetD . suitable means for water to drain below the footing

[单选题]A vessel is not in every way fitted for cargo service（）at the time of her delivery to the charterers her engine room staff is incompetent and inadequate，and accordingly she is unseaworthy.A . whetherB . shouldC . shallD . if

[单选题]（） or air venting arrangement is fitted to the fuel supply passage.A . An air pumpB . A compressorC . A fuel pumpD . A priming

[单选题]The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.A . aroundB . amongC . inD . betwee

[单选题]G．raham-Steel杂音见于A．动脉导管未闭B．主动脉瓣狭窄C．肺动脉瓣相对关闭不全D．重度主动脉瓣关闭不全E．室间隔缺损

[单选题]Battens are fitted in cargo holds across the frames of the vessel from the turn of the bilge upward. The purpose of these cargo battens is（）.A . for securing a snatch block when snaking cargo into the wings of the holdB . to prevent cargo from coming