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【简答题】
测得一种血红素蛋白质含0.426%铁，计算最低相对分子质量。一种纯酶按重量计算含亮氨酸1.65%和氨酸2.48%，问其最低相对分子质量是多少？
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【简答题】思想初步形成于
【简答题】I have to delay _________ the letter.
【单选题】I quickly answered your letter, for, if I delayed, you _________ I was not concerned about your difficulties. [
A.
] had thought [
B.
] thought [ C] would think [ D] were thinking
【简答题】I'll write back as soon as I __________your letter.