空载电流一般指变压器的()。
A、励磁电流
B、额定电流
C、最大电流
D、无功电流
参考答案:A
I'd like to share a story ______ music overcomes a physical barrier and makes a connection with a young student.[ ]
A. which
B. that
C. when
D. where
牙齿的萌出是指
A.牙齿出龈
B.牙胚突破牙囊
C.牙冠出龈及到达咬合的过程
D.牙齿咬合
E.牙胚形成到牙冠出龈