周转性储存是由______组成。
A.季节性库存
B.经常库存
C.在途库存
D.安全库存
E.国家库存
参考答案:B,D
Willpower is a kind of quality, _____ is _____ it takes to do anything well.
A.that; which
B.which; what
C.that; that
D.which; which
下述除哪一项外均为结核结节的成分()
A.Langhans细胞
B.类上皮细胞
C.中性粒细胞
D.成纤维细胞
E.淋巴细胞