In international trade, there are many ways to express quality, but（）.
A. only one can be used alone
B. it cannot be used alone
C. it can be used in combination with the specific situation
D. can't be combined to use
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When buying and selling by sample, the sample（）.
A. can only be provided by the buyer
B. can only be provided by the seller
C. can be provided by both the buyer and the seller
D. can be provided by a third party
If there is no other provision in the contract, the seller shall deliver the goods（）.
A. which can be roughly the same as the sample
B. with which reasonable tolerances are allowed
C. which must be consistent with the sample
D. which can be the same as the main characteristics of the sample
In the contract of sale, the seller is allowed to have the goods over or short shipped means（）.
A. there are some differences in the quality of delivery
B. there is a certain difference in the delivery quantity
C. there are some differences in packing specifications
D. it has certain flexibility in the valuation method
If the contract does not specify which method to calculate the weight and price, it shall be calculated by () .
A. gross weight
B. net weight
C. conditioned weight
D. theoretical weight
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