A. 正确 B. 错误
A. More than ever before B. In the past, there have never C. Never before have D. Formerly, there never were
A. 由加水手柄通过推拉钢索作动 B. 由加水手柄通过轴作动 C. 由加水手柄通过软轴作动 D. 由加水手柄通过拉杆作动