0度纬线有( )条,30度纬线有( )条.

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0度纬线有( )条,30度纬线有( )条.

0度纬线有( )条,30度纬线有( )条.
0度纬线有( )条,30度纬线有( )条.

0度纬线有( )条,30度纬线有( )条.
0度纬线有1条(即赤道),30度纬线有2条(南北纬)