问题：
[单选题]直线定向中，常用的标准方向有( )。 ①真子午线方向 ②y轴方向 ③磁子午线方向 ④指北方向 ⑤重力方向 ⑧中央子午线方向
A、①②④
B、①③④
C、①③⑥
D、②④⑥
参考答案：
C
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