治疗肺痿虚寒证,应首选的方剂是()
A.麻黄升麻汤
B.甘草干姜汤
C.清燥救肺汤
D.七味都气丸
E.麦门冬汤
参考答案:B
If a = 1 and , which of the following is NOT a possible value of b ?()
A.-2
B.-1
C.0
D.1
E.2
节能产品认证与能源效率标识的区别及联系是什么?