标准砝码检定室的湿度,应保持在()
A、20%~50%
B、30%~50%
C、50%~70%
D、50%~90%
参考答案:C
–Could you tell me ?
A.which is the way to the restroom.
B.where is the restroom
C.how can I get to the restroom
D.is there a restroom near here
以下哪项不符合支气管哮喘的表现
A.胸部X线见两肺透亮度增加B.血清IgE降低C.痰中见哮喘珠D.血中嗜酸性粒细胞增高E.PEF减少