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【单选题】
下列哪一种先天性心脏病可能出现水冲脉及枪击音（）A.
房间隔缺损
B.
室间隔缺损
C.
法洛四联症
D.
动脉导管未闭
E.
艾森曼格综合征
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反馈参考答案：
举一反三
【单选题】The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by（）
A.
governor flyweight action on a pilot valve which controls fuel injection
B.
governor flyweight motion acting on fuel controls through suitable linkage
C.
positioning a butterfly valve in the fuel delivery system positioning
D.
a servomotor piston attached to the fuel controls
【单选题】Movement of the pump control rack in a fuel injection system using individual plunger-type pumps
A.
changes the position of the fuel inlet ports
B.
changes the length of the pump stroke
C.
varies the quantity of fuel delivered
D.
varies the compression of the delivery valve spring
参考解析：
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