Passage 2Questions 6 to 10 are based on the following passage:When aluminum was Passage 2Questions 6 to 10 are based on the following passage:When aluminum was first produced about 分类:日语 题型:选择题 查看答案
往复泵设吸入空气室的作用是()。 往复泵设吸入空气室的作用是()。A.降低泵的启动功率B.贮存液体帮助自吸C.降低流量和排出压力脉动率D.减小吸压脉动,防止“气穴”现象 分类:日语 题型:选择题 查看答案