单项选择题

地面控制网三角锁，由于条件关系，必须采用插点插网时，应与原网一起观测，一起平差，以防原网的误差影响。 A. 对 B. 错

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单项选择题

Non-human cars are often called _______.‏

A．robot cars
B．autonomous cars
C．driverless cars
D．self-driving cars

The industry life cycle includes five stages, including the beginning stage, the growth stage, the shock stage, the maturity stage and the decline stage.

答案：正确