在招标过程中，对于那些紧急工程，如灾后恢复工程，要求尽快开工且工期较紧的工程，可能仅有实施方案，没有图纸，对这些工程采用（）等合同比较合理。

A．固定价

B．可调价

C．总价

D．成本加固定金额酬金

E．成本加奖罚

Which of the following statements about testing software with data is (are) true ( ) Ⅰ．The primary purpose of such testing is to find errors Ⅱ．Such testing can demonstrate the existence of errors but cannot demonstrate the absence of errors

A．Neither

B．Ⅰ only

C．Ⅱ only

D．Ⅰ and Ⅱ