缩窄型心包炎的特征性X线征象是（）
A.心脏搏动减弱
B.心缘僵直，正常弧形消失
C.心包钙化
D.间质性肺水肿
E.主动脉迂曲延长
参考答案：C
根据句首字母补全单词。
1. Thailand is a beautiful country, many people go s_____ there year.
2. It's an e_____ vacation. We played very happily.
3. Mike d______ to go fishing next Sunday.
4. I met an American t_______ in the Summer Palace yesterday.
5. We're l______ for Beijing next Sunday.
压力比的分配原则应按照（）的原则进行。
