火管锅炉牵条腐蚀变细直径变化小于原直径的（）时可以继续使用。
A．10％
B．20％
C．30％
D．40％
参考答案：A
In relation to corporate governance:
(b) Identify any TWO characteristics of a shareholding company that make it especially important for management to apply good standards of corporate governance. (4 marks)
婴幼儿和儿童的骨髓炎的特点有（）
A.骨生长障碍
B.骨骺早期闭合和发育畸形
C.骨破坏广泛容易造成大块骨干坏死
D.发病急
E.全身中毒症状重
