胶皮闸门是有杆泵井常用的井口配件之一,作用是()。 A.密封套管 B.密封油套环空 发布时间:2019-03-03 23:17 │ 来源:www.tikuol.com 题型:单项选择题 问题: 胶皮闸门是有杆泵井常用的井口配件之一,作用是()。A.密封套管B.密封油套环空C.密闭油管D.密封
题型:单项选择题 A crew member has suffered frostbite to the toes of both feet. You should().A.immerse the feet in warm waterB.warm the feet with a heat lampC.warm the feet at room temperatureD.rub the feet 查看答案