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中年人心理咨询主要有哪些内容?

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-3和4有等比中项.

A. 对
B. 错

2和8有一个等比中项.

A. 对
B. 错

Please select an answer which doesn’t indicate the difference between firm offer and non-firm offer?

A firm offer should be made when sellers promise to sell goods at a stated price within a stated time where non-firm offer not.
B. A firm offer should stipulate an expiry date but non-firm offer’s price is changeable anytime.
C. A firm offer is subject to obligation within validity while a non-firm offer is a kind of quotation without obligation.
D. A firm offer will be accepted but a non-firm offer will not be accepted by the buyer.

In what aspects can we make a counter offer? Please select an answer which is not right.

A. price terms
B. insurance
C. packing
D. shipment

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