只有相负荷时,等效三相负荷取最大相负荷的3倍。()
A. 正确
B. 错误
卵泡膜细胞有其受体,结合后使细胞内胆固醇形成睾酮和雄烯二醇
This question is not ______ that one.
A. so difficult than
B. so difficult as
C. as difficult than
Which of the following costs of consignment are fixed? ()
A. costs of documentation
B. costs of insurance
C. costs of customs clearance
D. costs of shipment