外源性凝血系统的作用起始于
A. 因子Ⅻ的激活
B. 因子Ⅺ的激活
C. 因子Ⅲ的释放
D. 因子Ⅶ及Ⅹ的激活
E. PF3的释放
When stowed on steel decks，the strongbacks and pontoons shall be secured with ______．
A. Dunnage or other suitable material
B. other strongbacks
C. hatch covers
D. other pontoons
______ is not a proper instruction for handling hatch covers．
A. not to obstruct clear fore-and-aft passageways
B. not to obstruct coaming-to-bulwark passageways
C. to be lashed or otherwise secured to prevent accidental dislodgement
D. to be laid on their sides
Which davit type may be operated by one man ________．
A. Quadrantal
B. Gravity
C. Sheath-screw
D. Radial
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