【判断题】车削加工的工艺特点就是工件旋转作主运动,车刀作进给运动。( )
【单选题】--Is my answer to the math problem fight? ---Let me consider it carefully I give you an answer.
【单选题】Car Maintenance Once it was considered good practice to let the car engine idle a minute or two following cold starts. Today with modern technology, the opposite is true. An engine operating under roa...
B.
Idling just burns gas(on average, about a gallon an hour)
C.
They commonly are harmful to other parts of the car
D.
They generate more rolling resistance than conventional tires
E.
Parking in areas of less or no sunlight helps prevent the gas from steaming that would occur if you parked in the hot sun
F.
The difference between winter and summer tire pressures can be as much as eight pounds
【单选题】关于极限弯矩与计算弯矩,以下说法错误的是( )
A.
计算弯矩是指船舶静置于标准波浪上,根据船舶外载荷计算而得的弯矩
B.
极限弯矩是指船体横剖面结构离中和轴最远点处拉应力达到材料屈服极限或压应力达到构件临界应力时,船体剖面所能承受的最大弯矩
C.
船体的过载能力可以用过载系数表征,过载系数为计算弯矩与极限弯矩之比
D.
计算弯矩与工况的选择有关,而极限弯矩与工况的选择无关
【简答题】let the engine( )before driving
【单选题】根据契税法律制度的规定,下列各项中,属于契税纳税人的是( )。( 2019年)
【判断题】车削加工时,主运动是主轴带动工件的旋转运动,进给运动是刀具的直线运动。
【单选题】分压式偏置电路如图所示,这一电路与基本的共射极放大电路相比,能够( )
【单选题】极限弯矩是指船体横剖面结构离中和轴最远点处的拉应力达到材料( )时,船体剖面上所对应的总弯矩 。
【判断题】车削加工的主运动是工件的旋转,进给运动是车刀的运动。( )