【单选题】The color of the exhaust from a diesel engine should be ____ in normal operation.
B.
hazy light brown(模糊的浅棕色)
【单选题】( )是在钢中加入较多的钨、钼、铬、钒等合金元素的材料,它可用于制造形状复杂的切削刀具。
【简答题】划分钢筋混凝土结构的抗震等级及抗震构造措施的意义?
【单选题】The color of the exhaust from a diesel engine should be _____ in normal operation.
【单选题】The color of the exhaust from a diesel engine should be ()
【简答题】电路中引入直流负反馈,可以______静态工作点。引入____负反馈可以改善电路的动态性能。
【单选题】The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by _____.
A.
pumping action of the piston
B.
pressure of the fuel charge
C.
vacuum developed in the manifold
D.
pressure of the fresh air charge
【判断题】抑制零点漂移可以采用差放电路,还可以在电路中引入直流负反馈。