经10次2000万人的研究,各次均发现吸烟者冠心病的死亡率高于不吸烟的()。
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在颐和园后山的苏州河中划船,远方的苏州桥主景,为两岸起伏的土山和美丽的林带所夹峙,构成明媚动人的景色。这属于造园手法中的()。
A. 抑景
B. 框景
C. 夹景
D. 添景
When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?()
A. During operation at low speed
B. During operation at rated speed, but low power output
C. During acceleration
D. All of the above
减压阀是保持阀后压力恒定。
A. 正确
B. 错误