A、the stem and heads are made of different material
B、low-alloy steel is used throughout
C、a replaceable valve disk is welded to the head
D、the self-centering action comes from motion of the valve stem in the guide
更多“A built-up exhaust valve is one in which （）.”相关的问题
A、No, you mustn‘t if you don‘t want. B、Leave it if you‘re exhausted. C、Washing-up is really exhausting. D、Washing-up really takes up time.
A、The Operator can make fine internal adjustments to the transmitter as long as the output power does not change by more than one percent B、The Operator is responsible for ensuring that INMARSAT antennas are free of built-up soot and clear of obstacles C、All levels of maintenance must be performed by a licensed GMDSS Radio Maintainer D、The Operator may install an EPROM in order to ensure that the equipment continues to operate within legal constraints
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