问题
单项选择题
My position has been obtained by（）.
A.astronomical observation
B.hydrographic survey
C.weather prediction
D.current sailing
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
My position has been obtained by（）.
A.astronomical observation
B.hydrographic survey
C.weather prediction
D.current sailing
参考答案：A