问题
单项选择题
For optimum stability during jacking operations，mat ballast tanks or spud cans should be（）.
A.empty
B.fully ballasted
C.partially ballasted
D.sealed
答案
参考答案：B
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For optimum stability during jacking operations，mat ballast tanks or spud cans should be（）.
A.empty
B.fully ballasted
C.partially ballasted
D.sealed
参考答案：B