为了确保实验室所用标准处于受控状态，将所用规范标准集中资料室管理，使用时方便查阅。
西汉初年，颁行的财政经济措施及其作用。
直销员将货物销售给消费者时，应按照规定缴纳的税种是（）。 A.增值税 。 B.消费税 。 C.营业税 。 D.印花税。
化能自养菌还原力的产生是在消耗ATP的情况下通过反向电子传递产生的。
Write a memo in about 50 words. You received a letter from a British customer complaining of the late delivery of their Order No.366.Then you looked into the matter and found it was the fault of your dispatch department.Write a short memo to your assistant, Jack Zhou. ·Ask him to visit your dispatch department and urge them to dispatch the order. ·Specify the goods, quality, and the deadline for dispatch. ·Add any relevant information you can think of.
往复机对填料与气缸的冷却水的温度要求是（）
