哪些病毒是常见的致畸病毒?
参考答案:
常见的致畸病毒包括巨细胞病毒、单纯疱疹病毒Ⅱ型、风疹病毒、水痘一带状疱疹病毒、柯萨奇病毒、人类免疫缺陷病毒、人 * * 瘤病毒等。
I believe that the 21st century is one ______ China will become one of the most powerful economic countries.
A.which
B.that
C.when
D.where
如何划分功率因数标准?