为什么大多数节流管汇有两个节流阀?()A、当在用节流阀出现故障时,以便提供替补阀。 发布时间:2019-12-29 11:34 │ 来源:www.tikuol.com 题型:单项选择题 问题: 为什么大多数节流管汇有两个节流阀?()A、当在用节流阀出现故障时,以便提供替补阀。B、引导到火炬中C、引导到分离器中。D、引导到钻井液池中。
题型:单项选择题 读图回答下列问题.(1)写出图中A点的经纬度.A(______,______)(2)A在B的______方,C在A的______方,D在A的______方.(3)A点所在纬线的长度比C点所在纬线的长度______【长、短、相等】.(4)C点位于地球五带中的______带.(5)如果要建一所四面都朝南的房子,它选址应在______. 查看答案
题型:单项选择题 Which of the following is caused by the earth's turning around the sun? [ ]A. The rising and setting (落下) of the sun and moon. B. The change of spring, summer, autumn and winter of the year. C. The change of the day and night.D. The time in the east is earlier than that in the west. 查看答案