The pilot, whether ______ or design, made the plane do a sharp turn. [ ]

A. by accident

B. at times

C. suddenly

D. all at once

流行性脑脊髓膜炎的确诊依据是

A．冬春季发病

B．高热、头痛、呕吐及脑膜刺激征

C．脑脊液呈化脓性改变

D．皮肤黏膜瘀点、瘀斑

E．皮肤瘀点涂片查到病原菌