【判断题】稳压管反向击穿后,电流变化很大,但其两端电压变化很小,利用此特性,稳压管在电路中可起稳压作用。
【单选题】下列哪项是缺血性卒中静脉溶栓的适应证
D.
症状开始出现至静脉溶栓干预开始时间<4.5小时
【单选题】下列哪项是缺血性脑卒中静脉溶栓的适应证()
B.
血糖<2.7mmol/L,血压≥180/110mmHg
D.
卒中症状持续至少30分钟,且治疗前无明显改善
【简答题】There is a ______ even though there have been attempts to get more girls to study physics.
【单选题】—Have you been teaching here since graduation? —No, I _____ on a farm for five years.
【单选题】下列哪项是缺血性脑卒中静脉溶栓的适应证
D.
症状开始出现至静脉溶栓干预开始时间小于4.5小时
【多选题】在PHP自动类型转换为布尔型时,下面的选项中哪些会被转换为false?
【单选题】There have been cases some English learners can’t get their message across even though they have memorized a lot of words.
【单选题】Ted _________________ in an accounting department since graduation.