单选题（） may be the first possible cause which makes the engine to lose power or slow down when it is running.AHot bearingBStarting valvesCUnequal distribution of loadDExcessive crankshaft clearance
单选题
（） may be the first possible cause which makes the engine to lose power or slow down when it is running.
A
Hot bearing
B
Starting valves
C
Unequal distribution of load
D
Excessive crankshaft clearance
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