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【单选题】
In the marine high voltage power system, ______.A.
there is still low voltage AC power supply for some power and lighting loads
B.
there is only low voltage AC lighting system
C.
there is not low voltage AC power supply at all
D.
there is only low voltage DC power supply
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A.
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to tell
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A.
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【单选题】生产过程中产生的职业危害因素包括化学因素、物理因素和生物因素。下列各类职业危害因素中，属于物理因素的是( )。
A.
触电、窒息
B.
高空坠落、物体打击
C.
噪声、辐射
D.
窒息、高温