下列哪项符合克罗恩病的特点()
A.病变呈连续性
B.病变在回肠末段及近段结肠
C.病变累及肠壁全层
D.常有瘘管形成
E.大便呈糊状,无脓血
参考答案:B, C, D, E
如图,点P是∠AOB的平分线上一点,PM⊥OA,PN⊥OB,垂足分别为M、N,若PM=2cm,则PN=______cm.
30. Only those who have experienced hardship ____ well aware of what happiness means.
A.can they be
B.they can be
C.can be
D.they can