单项选择题
Denebola is found in what constellation?（）
A.Hydrus
B.Leo
C.Centaurus
D.Aquila
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单项选择题
Deneb is found in what constellation?（）
A.Cygnus
B.Pegasus
C.Ursa Major
D.Andromeda -
单项选择题
Define the acronym MSI（）.
A.Maritime Safety Information
B.Maritime Shipping Index
C.Maritime Satellite Indicator
D.Mariner Safety Intelligence -
单项选择题
Deficient oxygen content inside a chain locker can be detected with（）.
A.litmus paper
B.combustible gas indicator
C.oxygen breathing apparatus
D.oxygen indicator
