男，3岁，头大颈短，面容呆板，唇厚、伸出口外。身长为80cm，前囟未闭，乳牙18个，走不稳，反应迟钝。X线摄片见腕部有3个骨化中心。诊断为散发性呆小病，应尽早使用

A．甲状腺片

B．碘剂

C．钙剂

D．生长激素

E．维生素D

The advantages of （） include better accuracy, customer service, precise control of transportation and data analysis capabilities to anyone capable of using the virtual database.

A.GPS

B.Information system

C.Virtual warehousing

D.Communication system