题目内容

在喷嘴挡板机构的静特性曲线上()。 ①两端变化快,中间变化慢 ②两端变化慢,中间变化快 ③上端变化快,下端变化慢 ④上端变化慢,下端变化快 ⑤中间段背压与挡板开度成比例关系 ⑥工作段由放大器起步压力决定

A. ①②③
B. ④⑤⑥
C. ②⑤⑥
D. ②③④

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以下不属于客户产品风险监测指标的是()。

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B. 产品库存
C. 产品对市场的应变能力
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