下列不是脊髓灰质炎康复治疗的禁忌证是()
A.病情不稳定
B.合并严重感染
C.合并其他脏器疾病
D.存在永久性功能障碍
E.不配合康复治疗
参考答案:D
If you have finished most of the work, you ______ start working so early tomorrow. [ ]
A. can't
B. mustn't
C. couldn't
D. needn't
对奥氏体不锈钢管道,进行水清洗时,水中的氯离子含量不得超过()。
A.25×10-5
B.25×10-6
C.25×10-7
D.25×10-4