脐疮的临床表现为（）
A.脐部有囊状突起物
B.脐部红肿热痛
C.脐部有脓水流溢
D.牙关紧闭、苦笑面容
E.烦躁啼哭
参考答案：B, C, E
We should ____, because he is still a child.[ ]
A. pardon him to be rude
B. excuse him for being rude
C. excuse to be rude
D. excuse him to being rude
电动机的润滑油（）月检查一次。
A.1
B.2
C.3
D.4
