边龙骨应按设计要求( )固定在四周墙上。
A．弹线
B．钻眼
C．钉眼
D．安装
参考答案：A
下列哪项不符合A型肺气肿表现（）
A.体型多消瘦
B.发绀不明显
C.桶状胸明显
D.病程晚期出现右心衰竭
E.多见于年轻人
The number of the cranes is getting ______. If we don't help them, they will disappear ______ a few years. [ ]
A. fewer and fewer; in
B. larger and larger; after
C. more and more; after
D. smaller and smaller; in
