商业发票的英文是（）
A. sale contract
B. invoice
C. packing
D. condition
Which one of the following risks can be independently insured with an insurance policy of CIC（）
A. General extraneous risks
B. War risks
C. All Risks
D. Strike risks
Counter sample can also be called（）
A. duplicate sample
B. sealed sample
C. return sample
D. reference sample
__ is to check regression faults.____是检查回归错误（）
A. Debugging
B. Maintenance
C. Regression testing
D. Acceptance testing
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