同一工作条件，若不改变轴的结构和尺寸，仅将轴的材料由碳钢改为合金钢，可以提高轴的而不能提高轴的（）
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国家安全机关、公安机关依照法律、行政法规和国家有关规定，履行防范、制止和惩治间谍行为以外的其他的职责，适用《中华人民共和国反间谍法》的有关规定
TheVHFCH16iscalled（）
A. common channel for pilot service
B. aircraft calling channel
C. international distress and safety channel
D. navigation safety communication channel
Advectionfog（）
A. only occurs at night and early morning
B. is most likely with Polar Maritime air
C. will only clear by insolation
D. can sometimes last for 24 hours or more in winter
Itmeans,whenB1B2B3B4equalstoAB00（）
A. a meteorological report
B. an ice report
C. the first weather forecast
D. an important message that cant be rejected
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