人体对哪些疾病不产生持久免疫力()
A.麻疹
B.流行性腮腺炎
C.猩红热
D.细菌性痢疾
E.水痘
参考答案:C, D
The suggestion we should have a discussion on this problem is not the one ________he made. [ ]
A. that, /
B. /, which
C. which, that
D. which, /
试述东道国法规对企业经营决策的影响。