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【单选题】
关于真空制动助力器助力功能检查,下述说法错误的是( )。
A.
在发动机熄火后，以相同的制动踏板力踩制动踏板若干次，确认制动踏板高度无变化后，踩住制动踏板不动，起动发动机，此时若制动踏板不动，说明真空助力器功能正常。
B.
在发动机熄火后，以相同的制动踏板力踩制动踏板若干次，确认制动踏板高度无变化后，踩住制动踏板不动，起动发动机，此时若制动踏板不动，则应检查真空管路。
C.
在发动机熄火后，以相同的制动踏板力踩制动踏板若干次，确认制动踏板高度无变化后，踩住制动踏板不动，起动发动机，此时若制动踏板不动，说明真空助力器无助力作用。
D.
在发动机熄火后，以相同的制动踏板力踩制动踏板若干次，确认制动踏板高度无变化后，踩住制动踏板不动，起动发动机，此时若制动踏板少许向前移动，说明真空助力器功能正常。
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