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对于阵发性室上性心动过速首选的抗心律失常药是
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强心苷中毒引起的快速型心律失常首选
1. Eachworkerputs in nearly 2,200 hours a year, _________ average, and contributes about $ 30 to GDP per hour. （2018-06）A. with B. in C. onD. under2. ______ some degree, all managers who supervise people are involved in HR activities. (2017-12)A. On B. To C. For D. With3. ____ my opinion, customer service here has improved but not as much as expected over the last two years. (2014-06)A.OnB. InC. ForD. With4. We will provide you with tips to help you keep your stress levels ______ control. (2013-12)A.forB. onC. underD..with
1.theflu (大疫) 2.togetaflue (疫苗) 3.good (良好卫生习惯) 4.the (持续的时间)ofthe commoncold 5.littleproofofits (效力) 6. (维生素C的) acid7. at the (细胞的)level 8. (相橘类的)fruits9. In (补充)form 10. therecommendeddaily (定量) 11. stones(肾结石)12. vitamin D (缺乏症)13. (认知的)impairment14.to grow in (流行)amongconsumers 15.The （attack）ofavirus16. clinical (临床试验) 17.totakea (安慰剂)18.toleaveyou (易患)viral 19.tocausemore （danger）thangood20.toget (接种)
死锁产生的原因不包括（）。
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