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【单选题】
一对渐开线直齿圆柱齿轮的安装中心距大于标准中心距时,()改变了。
A.
节圆和啮合角
B.
齿顶高
C.
瞬时传动比
D.
分度圆和压力角
拍照语音搜题，微信中搜索"皮皮学"使用
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相关题目：
【单选题】在定温定容系统中发生如下简单级数反应：A(g) → 2P(g)。当反应时间 t = 0、50 s、100 s、200 s 时，系统的总压分别为 1000 Pa、1200 Pa、1400 Pa、1800 Pa，则该反应的反应级数为
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