The projected total impulse of this motor is 2000 N-sec, which categorizes it as a "K" class motor.

预计总冲动，这是2000年汽车的N -秒，分类，它作为一个和“K”级的发动机。

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The middle class is the real motor of economic growth.

中产阶级才是经济发展的真正动力。

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You might use this if you later changed your mind and decided to move motor back to the Vehicle class.

如果您稍后改变主意，决定还是把 motor 移回到 Vehicle 类中，那么您也许就会用到这种重构。

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Where a C-class motor from Estes puts out the equivalent of 2 pounds of thrust for one second, an H-class motor--the entry point to high-power rocketry--puts out 55 pounds.

FORBES: Serious Toys

Also more pleasing than any motor in this class is BMW's in-line six.

FORBES: Test Drives

A-class was unveiled at the Frankfurt Motor Show in September.

ECONOMIST: Car safety