来源于上皮组织的恶性肿瘤是()。
A.癌
B.肉瘤
C.母细胞瘤
D.精原细胞瘤
E.霍奇金病
参考答案:A
UPS电源具备()显示、报警功能。
As we are ______ the market for Table Cloth, we should be glad if you would send us your best quotation.
A.in B.onC.entering D.at