12 10. Have you read our letter of December 18, in ______ we complained about the quality of your product?
A.
that
B.
where
C.
what
D.
which
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【判断题】When you are testing the difference between two means, it is notimportant to distinguish whether the samples are independent of eachother. True or false?
【判断题】decide whether the following statements are true or false. Inspection and testing are part of the operational techniques and activities to assure the quality of a product.