空气位操纵时，空气制动阀置中立位，中继阀将会呈（）。
A、充气缓解位；
B、制动位；
C、中立保压位；
D、缓解位。
参考答案：C
.
If this computer does not give complete satisfaction, please return it to the maker stating when and where it was ________.
A．designed
B．operated
C．purchased
D．made
英国宪法的渊源有哪些？
