蛋白质中氨基酸间的连接方式
A．肽键B．磷酸二酯键C．磷酸酯键D．酯键E．糖苷键
参考答案：A
Although he gave me a lot of ____ and drink, the doctor had ordered me a special ____.[ ]
A. food; diet
B. diet; food
C. foods; diets
D. diets; food
简述煤矿生产勘探的主要任务有哪些。
