When the steering wheel is turned, oil is directed to the steering gear rams by()
A. modulating the oil flow with the six-way valve
B. moving the automatic pressure differential valve
C. moving the receiving telemotor which regulates the tow-way valve
D. varying the eccentricity of a floating ting or angle of a tilting box
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口对口人工呼吸对大多数成人,规定在2秒以上给予___________ml/kg(约________ml)潮气量。
架线电机车的架线高度自轨面算起,在井底车场内,从井底到乘车场不小于2m。()
A. 正确
B. 错误
“科学组织生产,实现安全高效”不是2012年应当重点走好的十个方面工作其中之一.
A. 正确
B. 错误
从天轮到卷筒上的钢丝绳,在卷筒上缠绕时,最大内外偏角都不得超过2°30′。()
A. 正确
B. 错误