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【单选题】
学生a说，离心式点火提前调节装置能够在发动机负荷增大时调节点火提前角增大。学生b说，真空式点火提前装置的信号源来自发动机的进气管。他们说法正确的是（）。A.
只有学生a正确
B.
只有学生b正确
C.
学生a和b都正确
D.
学生a和b都不正确
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皮皮学刷刷变学霸
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A.
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【单选题】题目: 促进抗利尿激素释放的因素是 编号: CQAAQQU
A.
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B.
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C.
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D.
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E.
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