单选题
1分
Depths in the routes (Malacca and Singapore Straits) vary between 20 m and about 23 m but there are ...
Depths in the routes (Malacca and Singapore Straits) vary between 20 m and about 23 m but there are many areas of sandwaves and depths are liable to change. The statement infers that ______.
参考答案: B