图是利用杠杆提起重物的情景,O是支点,请画出F1的力臂L1和阻力臂L2.
患儿,女,1岁,因咳嗽5天伴气促1天以支气管肺炎、先心病收住入院,查体:生长发育落后,呼吸60次/分,双肺细湿啰音,心界向左下扩大,心率170次/分,胸骨左缘第3~4肋间有Ⅵ级粗糙收缩期杂音,腹软,肝肋下2cm。该患儿首优的护理诊断是()
A.生长发育的改变
B.清理呼吸道无效
C.气体交换受损
D.活动无耐力
E.潜在并发症:心力衰竭
— Is Jay coming by bus?
— He should, but he ____ not. He likes cycling along.
A.must
B.can
C.need
D.may