When the heat load begins to increase, the needle valve of an expansion valve will（）<br>A:move in an opening direction<br>B:move in a closing direction<br>C:either open or close<br>D:not move at all

When the heat load begins to increase, the needle valve of an expansion valve will（）
A:move in an opening direction
B:move in a closing direction
C:either open or close
D:not move at all

出自：海船船员证

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