Every student and every teacher ______.

A．are going to attend the meeting

B．has attended the meeting

C．have attended the meeting

D．is attended the meeting

嗜铬细胞瘤被切除后，血压降至90/60 mmHg，此时先采取的措施是：

A．输液扩容

B．输血或输血浆

C．皮质类固醇

D．α-肾上腺素能受体兴奋剂

E．多巴胺