Subject 4, also known as subject 4 theory test and driver theory test, is a part of motor vehicle driver's license assessment. After the implementation of the Ministry of Public Security 123 order, the subject three examination is divided into two contents. In addition to the road test, the common sense test of safety and civilization, commonly known as "subject four", is added, and "car morality" is considered.
An electronic signature is not a digital image of a written signature. It is actually an electronic code, through which the recipient can easily verify the identity and signature of the sender on the Internet. It can also verify whether the original text of the file has changed during transmission. If someone wants to send an important document to people in other places through the Internet, both the recipient and the sender need to apply for an electronic license from the licensing authority CA(GlobalSign).