关于胸腺瘤，哪项是错误的（）

A.分为上皮细胞型、淋巴细胞型、混合型

B.多位于前上纵隔

C.潜在恶性

D.约15%合并重症肌无力

E.重症肌无力都合并有胸腺瘤

Since the equipment looks SO large, it should be ( ) by ocean transport.

A．packed
B．shipped
C．packing D．shipping