呼吸困难“三凹征”是指
A．胸骨上窝、锁骨上窝、肋间隙吸气时明显下陷
B．胸骨上窝、锁骨上窝、肋间隙在呼气时明显下陷
C．胸骨上窝、锁骨上窝、剑突下窝在吸气时明显下陷
D．胸骨上窝、锁骨上窝、剑突下窝在呼气时明显下陷
E．胸骨上窝、锁骨下窝、纵隔在吸气时明显下陷