To prevent the build up of high stresses engine must not be run continuously （）.<br>A:faster than dead slow speed<br>B:slower than dead slow speed<br>C:with the output of MCR<br>D:at critical speeds

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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