城市营业窗口应放置（）的宣传资料。
A.收费
B.免费赠送
C.自助查阅
D.仅供翻阅
参考答案：B
___ help the people in the snowstorm in the south made him worried．
A．Not known how to
B．Unknown what to do to
C．His knowing not how to
D．His not knowing how to
COPD并发慢性肺心病，急性加重期最重要的治疗手段是
A．应用强心剂
B．应用利尿剂
C．控制肺部感染
D．应用血管扩张剂
E．应用呼吸兴奋剂
