— What's this? — .[ ]
A. This is cap
B. That is a cap
C. It is a cap
答案:C
釉柱晶体形态为()
A.方形
B.板状
C.针形
D.球形
E.扁六棱柱形
串联电路总电流()各支路电流。
A.近似于
B.小于
C.等于
D.大于