公路路线设计的总原则是满足行车( )舒适和美观的要求。
A. 安全
B. 快速
C. 经济
D. 旅游
E. 出行
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汽车下坡减速行驶过程中,其行驶阻力中( )为正值。
A. 空气阻力
B. 惯性阻力
C. 滚动阻力
D. 坡度阻力
汽车下坡减速行驶时,其行驶阻力中( )为负值。
A. 惯性阻力
B. 空气阻力
C. 坡度阻力
D. 滚动阻力
The disc, digitally_____ in the studio, sounded fantastic at the party that night.
A. recorded
B. recording
C. to be recorded
D. having recorded
With a lot of difficult problems ______, the manager felt worried all the time.
A. to settle
B. settling
C. settled
D. being settled