GPS测量时，接收机至少要接收（）颗卫星，才能正确解算定位。
A.3
B.4
C.2
D.6
参考答案：B
—Would you like some juice or milk?
—_______ is OK. I don't mind.[ ]
A. Either
B. Neither
C. Both
D. All
试说明轴承代号6037的含义。
