【判断题】任何情况下都可以使用小土铲作为取样工具。 ( )
【单选题】车票票价为旅客乘车日的()。承运人调整票价时,已售出的车票不再补收或退还票价差额。
【判断题】承运人调整票价时,对已售出的车票应补收或退还票价差额。()
【判断题】承运人调整票价时,已售出的车票该补收的补收,该退还的退还
【单选题】According to UNCISG, a contract can be established when ( ).
A.
an acceptance becomes effective
B.
the seller and buyer sign on a written contract
C.
the contract is approved by authorities
D.
an offer reaches the offeree