北斗卫星导航系统（CNSS），是除美国的全球定位系统（GPS）、俄罗斯的GLONASS之后第三个成熟的卫星导航系统。
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Welding______________________.
A. It is fixing the base and the sides together
B. It is basic.
C. It is where we do it.
Measuring vehicles _________________.
A. This is done here and there.
B. This is done with a ruler.
C. This is done with laser equipment.
Repairs ____________________________.
A. Repairs are done with state-of-the-art laser equipment.
B. Repairs are carried out by other companies.
C. The company can repair semi-trailers.
Crane and lifting systems _______________.
A. They are needed to rapair the semi-trailers.
B. They are used when painting the semi-trailers.
C. This is where the logos are painted.
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