单选题To prevent the build up of high stresses engine must not be run continuously （）.Afaster than dead slow speedBslower than dead slow speedCwith the output of MCRDat critical speeds
单选题
To prevent the build up of high stresses engine must not be run continuously （）.
A
faster than dead slow speed
B
slower than dead slow speed
C
with the output of MCR
D
at critical speeds
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