【单选题】【单选】The mean draft of a ship is draft ______.
A.
midway between the forward and aft draft marks
B.
at the center of flotation
D.
at the center of buoyancy
【单选题】For a floating vessel,true mean draft is always the().
A.
average of the observed drafts
B.
draft at the center of flotation
C.
draft corresponding to the calculated displacement
D.
mean of the calculated drafts
【单选题】维生素 D缺乏性手足搐搦症最常见的症状是
【单选题】原发性慢性肾上腺皮质功能减退症,可由感染、自身免疫性肾上腺炎、恶性肿瘤转移、双侧肾上腺切除和放射治疗破坏等引起。在感染性病因中,最常见的是()。
【单选题】关于心脏和大血管的摄片检查错误的是下列哪一项()
D.
可以初步观察心脏形态,估计各房室大小和肺循环异常的类型
【单选题】The mean draft of a ship is the draft _______
A.
Midway between the forward and aft draft marks
B.
At the center of flotation
D.
At the center of buoyancy