Before starting any diesel or gasoline engine，which of the following must be checked? （）<br>A:Oil level<br>B:Flow of cooling water<br>C:Exhaust discharge<br>D:All of the above

Before starting any diesel or gasoline engine，which of the following must be checked? （）
A:Oil level
B:Flow of cooling water
C:Exhaust discharge
D:All of the above

出自：海船船员证

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