小儿阑尾炎术后常见并发症有()
A.切口感染
B.肠粘连
C.腹腔残余脓肿
D.盆腔脓肿
E.以上均是
参考答案:E
Please hold on to _____you are strong and try to improve the weak subjects.
A.when
B.where
C.what
D.which
已知NaOH溶液的浓度为400mg/L,求此溶液的pH值。