男性，75岁，心绞痛发作持续4小时。含硝酸甘油无效。心电图示Ⅱ、Ⅲ、aVF导联呈弓背样抬高6mm，V1~V3导联ST段水平样压低4mm，偶发室性期前收缩1次，诊断为急性心肌梗死。

此时治疗应首先（）

A.静脉滴注普罗帕酮

B.静脉滴注异丙肾上腺素

C.应用升压药

D.临时心脏起搏

E.静脉滴注阿托品

Most computer systems are (71) to two different groups of attacks：insider attacks and outsider attacks．A system that is known to be (72) to an outsider attack by preventing (73) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (74) users．Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment,but also helps to prevent future attacks．These attacks are usually (75) by tools referred to as Intrusion Detection Systems．

（75）处填（）。

A．searched

B．checked

C．tested

D．detected