第6题: [单项选择]How much will the man pay A. $25. B. $50. C. $20. D. $40. 参考答案:A 答案解析:M: How much are the tickets
W: They’’re ten dollars each for the general public, but student ticke
第21题: [单项选择]Up to now, nothing () Betty. I want to know the reason () he hasn't written to me. A. has heard from; that B. was heard from; that C. has been heard from; why D. heard from; why 参考答案:C 答案解析:
第27题: [单项选择]诊断窦性节律的心电图表现为() A. P波在Ⅰ、Ⅱ、aVF导联应直立,在aVR导联应倒置,PR间期≥0.12秒 B. P波在Ⅰ、aVL导联倒置,aVR导联直立,PR间期≤0.12秒 C. P波在Ⅰ、Ⅱ、aVF导联倒置,aVR导联直立,PR间期<0.12秒 D. P波在Ⅰ、Ⅱ、aVF导联直立,aVL、V4~V6导联倒置,PR间期>0.12秒 E. P波在Ⅰ、Ⅱ、aVF导联直立,aVL导联倒置,PR间期<0.12秒 参考答案:A
第28题: [单项选择]
综合安全技术
对于产生可燃粉尘的生产装置可以进行惰化防护,即在生产装置中通入惰性气体,使实际氧含量比临界氧含量低( )。 A. 50% B. 40% C. 30% D. 20% 参考答案:D