比重年份货物 |
甲 |
乙 |
丙 |
丁 |
1871~1873 |
2.8 |
30.2 |
0.9 |
0.9 |
1881~1883 |
5.8 |
22.8 |
0.3 |
1.1 |
1891~1893 |
14.6 |
20.5 |
5.9 |
1.8 |
1901~1903 |
18.6 |
19.7 |
4.2 |
1.7 |
1909~1911 |
12.8 |
16.7 |
4.8 |
3.0 |
1919~1921 |
9.6 |
18.4 |
2.4 |
5.0 |