计算题:当制动缸压力为350KPa时,若制动缸内径为152mm,求一个制动缸的制动原力?
送礼应注意什么:() ["A、礼品的定位","B、礼品的贵重程度","C、礼品的选择","D、送礼品的时机"]
商务礼仪的规范性是:() ["舆论约束","自我约束","强制约束","非强制约束"]
会客的座次排列分:() ["自由式排列","相对式排列","并列式排列","一排式排列"]
相对式排列时:() ["以右为尊","以左为尊","以外为尊","以内为尊"]
计算题:现有5/4英寸无缝管一根,需将其弯曲70度,求其加热长度。