What does the professor imply when he says this?
A.At least 4 satellites can make 3D position.
B.To make 3D position three satellites are enough.
C.At least 4 satellites can make 2D position.
D.The GPS receiver is very difficult to lock.
第6题
为防止连杆螺栓运转中自行松退所采用的止退措施中,不正确的是()。
A.开口销止退
B.螺纹部分镀铜止退
C.8字形串联钢丝止退
D.定位销止退
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