A.赤道帶縱縫焊接→上溫帶與赤道帶環(huán)縫焊接→上溫帶縱縫焊接→上極帶與上溫帶環(huán)縫焊接→上極帶縱縫焊接
B.赤道帶縱縫焊接→上溫帶縱縫焊接→上極帶縱縫焊接→上溫帶與赤道帶環(huán)縫焊接→上極帶與上溫帶環(huán)縫焊接
C.上溫帶與赤道帶環(huán)縫焊接→赤道帶縱縫焊接→上溫帶縱縫焊接→上極帶與上溫帶環(huán)縫焊接→上極帶縱縫焊接
D.上溫帶與赤道帶環(huán)縫焊接→赤道帶縱縫焊接→上溫帶縱縫焊接→上極帶縱縫焊接→上極帶與上溫帶環(huán)縫焊接