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根据以上材料，回答第45题___________
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填空题：根据以上材料，回答第45题___________
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When (heat) __________, iron can be changed into liquid.
When (heat) __________, iron can be changed into liquid.
事由
事由
Tramp rates remain comparatively steady over a period of tim
Tramp rates remain comparatively steady over a period of time．（ ）
Methods of transport is one of the terms of shipment．（ ）
Methods of transport is one of the terms of shipment．（ ）
The types of rates available in air freight markets can be d
The types of rates available in air freight markets can be divided into 3 catego