吸苯操作时，为什么洗油温度应保持比煤气温度略高几度？
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颅脑损伤的病人，腰椎穿刺抽出血性脑脊液，首先应考虑（）
A. 脑挫裂伤
B. 硬脑膜外血肿
C. 脑震荡
D. 脑水肿
E. 颅盖骨骨折
Your vessel has lifeboats on both sides. Lifeboat No. 2 is located（）.
A. forward of lifeboat No. 4 on the starboard side
B. forward of lifeboat No. 4 on the port side
C. aft of lifeboat No. 1 on the starboard side
D. All of the above
消音弯管的平面边长大于___mm时，应加设吸引导流片。（）
A. 400
B. 500
C. 700
D. 800
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