A. 正确 B. 错误
A. having been given B. to have been given C. having given D. to have given
A. 1.5t/m3~1.7t/m3 B. 1.6t/m3~1.8t/m3 C. 1.9t/m3~2.0t/m3 D. 1.8t/m3~1.9t/m3