有铁垫板钉遭钉时，半径在800m及以下曲线（含缓和曲线）地段，每根木枕上每股钢轨内侧钉（）。
参考答案：2个道钉
从Ⅱ栏中找出与Ⅰ栏相对应的答语。
Ⅰ
1. When is your birthday?
2. How much is the blue T-shirt?
3. What's the time?
4. What does he do?
5. Why do you like monkeys?
Ⅱ
A. It's ten o'clock.
B. He's a teacher.
C. My birtbdayis September 1st.
D. Because they are cute.
E. It' s ten dollars.
1. ______2 ．______ 3. ______ 4 ．______ 5 ．______
急性脓胸的治疗原则（）
A.应用广谱抗生素
B.消除致病原因和脓腔
C.胸膜腔闭式引流
D.胸膜纤维板剥除手术
E.彻底排净脓液，使肺早日复张
