蛋白质生理价值的高低,主要决定于
A.氨基酸的种类B.氨基酸的数量C.必需氨基酸的数量D.必需氨基酸的种类、数量及比例
参考答案:D
Mr. Brown said that his car needed
A.to be repaired
B.being repaired
C.be repairing
D.to repair
承运人应于何时发出催领通知?