As coal mines became deeper, the problems of draining water, bringing in fresh air, and ________to the surface increased.
Câu hỏi
Nhận biếtAs coal mines became deeper, the problems of draining water, bringing in fresh air, and ________to the surface increased.
Đáp án đúng: D
Lời giải của Luyện Tập 365
Câu hỏi liên quan
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