【单选题】在凸轮机构中,从动件的运动规律为 时,机构会产生刚性冲击
【单选题】在经济订货批量基本模型中,某公司每年耗用甲材料 80吨,每吨价格为 100元,每批订货成本为 50元,每吨材料年平均储存成本为 20元,则经济订货批量为( )。
【单选题】当患者血清钠<120mmol/L时,其输液治疗原则正确的是
【简答题】The following words adjectives ending with the suffixes -ent and -ant , their corresponding nouns usually ending with -ence , and -ance . Decide which of the following should be the former, and which ...
【单选题】从防腐剂的组成看,属于多肽类物质的是( )
【多选题】天南公司向海北公司提出购买100吨煤炭,每吨价格300元,海北公司同意供100吨煤炭,但要求每吨价格提到350元,天南公司表示同意。关于该合同,下列说法错误的是( )。
【简答题】Fill in the blanks with words that are often confused. 1. historic, historical A. _______________research has proved that the Trojan war was a real . B. The ending of the cold-war is a __________...