∠1和∠2为锐角,则∠1+∠2满足[ ]
A.0°<∠1+∠2<90°
B.0°<∠1+∠2<180°
C.∠1+∠2<90°
D.90°<∠1+∠2<180°
答案:B
I can't remember what he looked like when we met __________ the first time.[ ]
A. in
B. on
C. at
D. for
腰椎穿刺的绝对禁忌症是()
A.高血压
B.心脏病
C.脑疝形成
D.癫痫
E.贫血