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【单选题】
松开复合按,按的动合触点和动断触点动作情况是(A.
动断触点先断幵
B.
动断触点先闭合
C.
动合触点先闭合
D.
动合触点先断开
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举一反三
【简答题】最古老的保险是从海上保险发展起来的。( )
【单选题】According to Richard,what was the concept of health before the 1940s?
A.
Mechanical operation of the body.
B.
Absence of disease or illness.
C.
Physical, mental and social well-being.
D.
Clean water, improved sanitation and housing.
【单选题】What publications should a GMDSS Operator consult regarding the proper set-up and operation of vessel equipment ________．
A.
ITU Publications
B.
The manufacturers instruction manuals
C.
Part 90 of the FCC Rules and Regulations
D.
Code of Federal Regulations，Title 47，Part 80，Subpart W
【简答题】深沟球轴承内外圈剖面线方向应 。
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