嵌顿性疝在下列哪种情况下,可试行手法复位()
A.疝块巨大、病史较长
B.嵌顿在3~4小时内
C.年老体弱估计无肠坏死者
D.老年人的股疝
E.无肠梗阻表现者
参考答案:B, C
----What a nice meal! It's really kind of you to invite us.
---- ______________. I'm glad you liked it.
A.Sounds good.
B.Well done
C.Never mind
D.Not at all
电动势的方向规定,在电源(),由()指向()。