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【单选题】
接触牛痘疫苗后产生对天花的抵抗性，这反映了A.
主动保护
B.
先天免疫
C.
病毒的超感染
D.
抗原的交叉反应
E.
抗原的特异性
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反馈参考答案：
举一反三
【单选题】S1: Could you introduce all the machinery on deck? S2: Sure. Let's go to the forecastle deck and start with the windlass. Q: Where was the windlass situated?
A.
On the forecastle deck.
B.
On the poop deck.
C.
On the weather deck.
D.
On the main deck.
【单选题】These include deck machinery such as mooring equipment,cranes and _____.
A.
boiler
B.
bow thrusters
C.
stabilizers
D.
hatch covers
【单选题】What is another name for New York?
A.
Big Ben.
B.
Big Port.
C.
Big Apple.
D.
Big Bear.
【单选题】Mechanical gearing of deck machinery such as the windlass or boat hoists should（）.
A.
be open to view so，if a foreign object gets in the gearing，the operator can immediately stop the machinery
B.
have a guard over the gearing
C.
be painted a contrasting color from the base color in order to call attention to the gearing
D.
not be operated if there is any crew within 10 feet of the machinery
【单选题】Deck machinery, which is also known as hull machinery, includes all power driven equipment located _____ the machinery spaces that is _____ with the main propulsion plant.
A.
inside / associated
B.
inside / not associated
C.
outside / associated
D.
outside / not associated
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