下列选项不属于低钾型周期性瘫痪心电改变的有（）
A.U波出现
B.病理性Q波
C.Q-T间期延长
D.S-T段下降
E.P-R间期延长
参考答案：B
Do the following characteristics have to be met in order to classify a liability as current on the balance sheet Characteristic 1: Settlement is expected within one year or operating cycle, whichever is less. Characteristic 2: Settlement will require the use of cash within one year or operating cycle, whichever is greater. Characteristic 1 Characteristic 2（）①A. No Yes ②B. No No ③C. Yes No
A. ①
B. ②
C. ③
根据新版的《中国居民膳食营养素参考摄入量（DRIs）》，建议50岁以后钙的适宜摄入量（AI）均为（）
A.800mg/d
B.1200mg／d
C.1000mg/d
D.1500mg／d
E.2000mg/d
