一T₈脊髓损伤患者，膀胱功能障碍，能自行排出部分尿液，无合并 * * 感染，泌尿系统B超未见异常，现进行膀胱控制训练，每日间歇导尿2次，一般建议每日保持尿量约多少ml为宜（）

A.500以下

B.400～600

C.800～1000

D.1800～2000

E.2000以上

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．Ⅱonly

D．Ⅰand Ⅱ