问题
单项选择题
Equipment requirement vary according to（）.
A.Ship owner‟s will
B.economic condition
C.the area in which the ship operates
D.different orders of all countries
答案
参考答案：C
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Equipment requirement vary according to（）.
A.Ship owner‟s will
B.economic condition
C.the area in which the ship operates
D.different orders of all countries
参考答案：C