Quality planning tools are often used to help plan effective quality management activities.（）is one of such tools,which involves comparing actual or planned project practices to those of other projects to generate ideas for improvement and to provide a basis by which to measure performance.

A.Benchmarking

B.Quality metric

C.Quality checklist

D.Brainstorming

下列有关重症肌无力的叙述，哪项不正确（）

A.约8%～10%肌无力患者系胸腺小细胞性肿瘤所致

B.常合并有胸腺肥大

C.有症状都适于施行胸腺切除术

D.为急性、非免疫性疾病。症状晨重晚轻

E.可用抗胆碱酯酶药物治疗