In designing a logistical system, a delicate balance must be maintained betweentransportation cost and（）
D
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Thefollowingservices（）areperformedbytheforwarderonbehalfoftheexporter.
General Cargo Rates are normally higher than Specific Commodity Rates in aircargo transportation.
Simplified words are commonly used in telex messages because the charge for atelex is based on （）.