根据《导游人员管理条例》的规定,临时导游证的有效期为( )。
A.30天 B.3个月 C.6个月 D.3年
参考答案:B
男,40岁。水肿、乏力、腹胀2个月,有乙肝病史。查体:全身水肿,腹壁静脉曲张,腹水征(+)。下列哪项与该患者腹水形成无关()。
A.钠与水的潴留
B.血管滤过压增高
C.血管通透性增加
D.血浆胶体渗透压降低
E.淋巴液生成过多
An analyst gathered information about three economic variables. He noted that whenever variable A increased by one unit, variable B increased by 0.2 units but variable C decreased by 0.7 units. The correlation between variables A and B and the correlation between variables A and C, respectively, are closest to: Correlation between variables A and B Correlation between variables A and C()
A. 1.0 -1.0
B. 1.0 -0.5
C. 0.5 -1.0