胸腔插管后插在水封瓶液面下的玻璃管的适宜长度为（） A.1～2cm B.2～3cm

用科学记数法表示305000=______，6.3×10⁴原数为______．

良好的X线诊断照片影像的密度范围是（）

A.0.2～1.0

B.0.2～1.5

C.0.25～2.0

D.0.3～1.8

E.0.5～2.0

痫证风痰闭阻证主方（）

A.涤痰汤

B.定痫丸

C.导痰汤

D.镇肝熄风汤

E.风引汤

Questions 14-18

·Using the information in the text, complete each sentence 14-8 with an expression from the list below.
·For each sentence (14-18), mark one letter (A -G) on the Answer Sheet.
·Do not mark any letter twice.

• A. different colors
• B. hair follicles
• C. dietary fiber
• D. antioxidant activity
• E. their cholesterol
• F. hair loss
• G. free radicals

A common problem in the elderly is ______.

计算题：某台锅炉侧墙水冷壁上联箱标高45.8m，下联箱标高5.3m，管子冷态20℃；热态时管壁的计算平均温度360℃，取膨胀系数a=12×10-6m/（m•℃），请计算侧墙水冷壁热态向下膨胀量。