出口食品卫生注册证书的有效期为3年。()
参考答案：对
It was _______ useful information that the company _______ much money on it.[ ]
A. so a, paid
B. such, spent
C. so an, paid
D. such a, spent
临床治疗血虚证常配伍益气药的机理是（）
A．气能行津
B．气能生血
C．气能摄血
D．津血同源
