办公室、教室、检验室等房间宜选用光源的相关色温为()。
A.2700~3000K
B.4000~4500K
C.5500~6000K
D.6000~7000K
参考答案:B
Which of the following functions would the nurse expect to be unrelated to the placenta
A.Production of estrogen and progesterone.
B.Detoxification of some drugs and chemicals.
C.Exchange site for food, gases, and waste.
D.Production of maternal antibodies.
托收业务中,出口地银行对出口商的资金融通,可以采取();委托人或代收行对进口商的资金融通可以允许进口商()。