Flywheel inertia tends to keep the __ rotating at a constant speed.

[单选题]High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.A . many thousand timesB . between timesC . one timeD . at time

Although the traffic is not busy, he likes to drive at a ___ speed.A. spareB. fa

[单选题]The prefix mach is used to describe supersonic speed. It was named after Er

[单选题]The prefix mach is used to describe supersonic speed. It was named after Er

[单选题]The prefix mach is used to describe supersonic speed. It was named after Er

[单选题]The prefix mach is used to describe supersonic speed. It was named after Er

[单选题]The prefix mach is used to describe supersonic speed. It was named after Er

In a time of social reform, people’s state of mind tends to keep ______ with the

No matter who he is, young or old, people’s state of mind tends to keep（）with th

[单选题]No matter who he is, young or old, people's state of mind tends to keep ___