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单选题
太阳真出没是指（）。
A
太阳上边沿与水天线相切时
B
太阳上边沿与测者地心真地平相切时
C
太阳中心恰好通过测者地心真地平时
D
太阳下边沿恰好与测者地心真地平相切时
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进、排气阀阀面过度磨损，密封不良漏气B
进、排气阀阀杆与导套过度磨损，密封不良漏气C
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Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operationB
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A和B和C
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