结合《废墟》谈谈余秋雨对废墟进行了哪些方面的思考。
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复合钻杆柱是一种上部尺寸小，下部尺寸大的组合方式。
A. 正确
B. 错误
对怀疑有颈椎骨折的伤员进行人工呼吸应采用什么方法？
Late fuel injection timing is indicated by （）
A. lower than normal cylinder pressure and low exhaust temperature
B. lower than normal cylinder pressure and high exhaust temperature
C. higher than normal cylinder pressure and low exhaust temperature
D. higher than normal cylinder pressure and high exhaust temperature
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