12.[判断题]A buyer cable an acceptance to an offer, but requiring to change payment from D/P at sight to D/A. The seller kept silence. A contract could be established at this moment.
我的答案 :错

A. 　The sender must be the potential buyer.

B. 　It is not a necessary step to conclude a contract.

C. 　It is an invitation to offer.

D. 　Neither the sender nor the recipient of an inquiry is bound.
我的答案:A

A. 正确

B. 错误

A. 　n irrevocable offer means that the offeror has no right to withdraw the offer.
我的答案 :错

B. 错误

A. 　an offer reaches the offeree

B. 　an acceptance becomes effective

C. 　both seller and buyer sign on a written contract

D. 　the contract is approved by authorities
我的答案:B

A. 正确

B. 错误

A. 　the party who invites the offer

B. 　the party to whom the offer is made

C. 　the party who makes the enquiry

D. 　the party who makes the offer
我的答案:D

A. 正确

B. 错误

A. 　It must be addressed to specific person(s).

B. 　It must be sufficiently definite to include description of commodity, quantity, price, payment, shipment and insurance, etc.

C. 　It should indicate the offeror's intention to be bound in case of acceptance.

D. 　An offer must be a proposal for concluding a contract.
我的答案:B

A. 　payment terms

B. 　price

C. 　packing

D. 　quality and quantity
我的答案:C

A. 　a form of counteroffer

B. 　an unconditional refusal

C. 　an acceptance with reservation

D. 　 a conclusion of contract
我的答案:A