—Who should be responsible for the accident —The boss, not the workers. They just carried out the order ______.

A．as told

B．as are told

C．as telling

D．as they told

女，30岁。G1P0，孕38周，患风湿性心脏病，心功能Ⅰ～Ⅱ级，胎儿估计2700g，宫口开全20分钟，先露头，降至+3，胎位 LOT，分娩时处理正确的是

A．剖宫产术

B．吗啡皮内注射

C．侧切待其自然分娩

D．助产缩短第二产程

E．胎儿娩肩肌注麦角新碱预防产后出血