急性胰腺炎急性期一般需要禁食 ()
A.1d
B.2d
C.3d
D.4d
E.5d
参考答案:C
The ______ zone ranges from touching to 18 inches. It is usually reserved for the very few special people in our lives who are very close to us.
长期毒性试验的目的是()。
A.观察由于蓄积对机体产生的毒性反应及严重程度
B.提供毒性反应的靶器官及其损害是否可逆
C.确定无毒反应的剂量
D.为拟定人用安全剂量提供参考