Piggyback is a system of unitized multimodal land transport by （）.
A、roadandseaB
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Oneoftheadvanesinthemultimltransportistoprovidefastertransitofs.
Timecharteringmeansthatthechartererhiresthevesselforaperiodoftimewithoutcrew.
Normallytrampratesfluctuatewithmarketconditionsofsupplyanddemand.
Whichofthefollowingcoveragedoesnotcoverpartiallossordamageresultingfromnaturalcalamities?____
Piggybackisasystemofunitizedmultimodallandtransportby（）.
