SI: Do you have sufficient dunnage planks and mats on board? S2 : I' m afraid we need some more. Q: What‘s the probable relationship between the two speakers?
A.
A pilot and a captain
B.
An agent and a captain
C.
A customs officer and a captain
D.
An engineer and a captain
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【单选题】某金属离子 M 与试剂 R 形成一有色络合物 MR ,若溶液中 M 的浓度为 1.0×10 -4 mol . L -1 ,用 25px 吸收池于波长 525nm 处测得吸光度 A 为 0.400 ,此络合物在 525nm 处的摩尔吸光系数为 ( )