制动过程中当车轮出现抱死，在地面产生拖印时，即能产生最大制动力。()
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装有ABS系统的汽车，在制动后期，会有车轮被抱死，地面留有拖印的现象。()
启动机换向器的作用是使直流电动机维持定向旋转。()
The example of Cambodia is used to represent______.
A. a country that needs more phones
B. a country that has a high percentage of cell phone users
C. a country that uses cell phones to avoid high infrastructure costs of traditional phone systems
D. a country that uses mail
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