稀释哮喘持续状态患者痰液的首要方法是（）
A.应用祛痰剂
B.大剂量抗生素
C.体位引流
D.应用支气管扩张剂
E.补液纠正失水
参考答案：E
____ of that country ____ by snow. [ ]
A. Two-third, is covered
B. Two-thirds, is covered
C. Two-thirds, are covered
D. Two-third, are covered
冬季采用全面通风方式消除余热、余湿及稀释低毒性有害物质时，室外气象参数应取（）。
A.冬季采暖室外计算温度
B.冬季日平均室外计算温度
C.冬季逐时计算温度
D.冬季通风室外计算温度
