若干元件流过同一电流称为()。
A.串联;
B.并联;
C.混联;
D.星形连接。
参考答案:A
–What does your friend look like?
–She is of medium build, and she has _______ hair.
A.sad
B.long
C.busy
D.small
龈上菌斑通常为()
A.光滑面菌斑与邻面菌斑
B.附着菌斑与非附着菌斑
C.舌侧菌斑与颊侧菌斑
D.光滑面菌斑与点隙裂沟菌斑
E.点隙裂沟菌斑与根面菌斑