A.3 W
B.6 W
C.12 W
D.15 W
答案:C
由,由,得=12 V,所以2A,,所以C正确。
与牙周炎发生有关的修复体是
A.固定桥
B.充填体悬突
C.桩冠
D.全冠
E.桩核冠
The Great Wall is one of the greatest wonders in the world, ______ people visited it every year.[ ]
A. the number of
B. a number of
C. all the number of