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
