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【单选题】
运动速度( )时宜采用粘度较低的液压油减少摩擦损失:工作压力( )时宜采用粘度较高的液压油以减少泄漏。A.
高 低
B.
高 高
C.
低 高
D.
低 低
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following option is not the direct cause of the Tianjin explosion?
A.
Local drying of nitrocellulose in the container at the south side of the dangerous goods warehouse due to the loss of wetting agent
B.
Under the action of high temperature (weather) and other factors, the decomposition of nitrocellulose is accelerated to release heat, and the accumulated heat is self ignited
C.
The nitrocellulose and other dangerous chemicals in the adjacent containers burn in large area for a long time, resulting in the explosion of dangerous chemicals such as ammonium nitrate stacked in the arrival area
D.
Explosion of magnesium powder
【简答题】简述急性心肌梗死心电图的特征性改变