胸导管常注入（）
A.右静脉角
B.左静脉角
C.上腔静脉
D.左颈内静脉
E.头臂静脉
参考答案：B
Mary made coffee ________ her guests were finishing their meal.[ ]
A．so that
B．although
C．while
D．as if
A．飞机翅膀的截面形状应该反过来
B．两艘并列同向行驶的船只不会相撞
C．地铁、火车站的站台安全线不必设置
D．喷雾器再怎么用力吹也喷不出雾来
