单选题When the direction handle of telegraph is moved, the relative position of camshaft and crankshaft will be（）Achanged accordinglyBunchangedCpositioned aheadDpositioned astern
单选题
When the direction handle of telegraph is moved, the relative position of camshaft and crankshaft will be（）
A
changed accordingly
B
unchanged
C
positioned ahead
D
positioned astern
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