炉渣碱度

A. It’S too expensive．
B. It’S in a hotel．
C. His wife Can’t come here to stay with him．
D. It’S not big enough and noisy．

A. V1、V2、V3
B. V3、V4、V5
C. V6、aVL
D. V1～V4
E. V1～V6、aVL

A. 1d～2d
B. 2d～4d
C. 7d～14d
D. 15d～21d
E. 120d