The motor carrier administration is already considering a rule to tighten its standards for medical certification of commercial drivers.
汽车运输安全管理局已在考虑将商业驾驶的医师证明标准规定得更紧。
2
Four kinds of common motor phase failure operation are analysed, and therefrom the current-voltage equal-ratio rule is derived and verified.
分析了四类常见的电动机断相运行，并由此推出和验证了断相运行状态下的电流—电压等比规律。
3
This product winds the coil for the motor, form rule, hollow inside, the side has grooves, it requires it is able to bear all, able to bear chemistry and corroded, wear-resisting.