【判断题】在同一品种石油沥青材料中随着牌号增加,沥青黏性增加(减小),塑性增加,而温度敏感性减小
【单选题】下列工件定位面与定位元件不是限制三个自由度的是:( ACE )
【判断题】在同一品种石油沥青材料中,牌号愈小,沥青愈软;随着牌号增加,沥青黏性增加,塑性增加,而温度敏感性减小。()
【单选题】When acceleration is _______, a velocity of a particle is constant.
【简答题】3-2Translation: Newton’s second law implies that: When a body is acted upon by a constant force, its resulting acceleration is inversely proportional to the mass of the body and is directly proportion...
【判断题】When a body oscillating on a horizontal spring passes through its equiibrium position, its acceleration is zero. When the bob of an oscillationg simple pendulum passes through its equilibrium position...
【单选题】The magnitude of the normal acceleration is
A.
proportional to radius of curvature.
B.
inversely proportional to radius of curvature.
D.
zero when velocity is constant.
【单选题】When acceleration is _______, a velocity of a particle is constant.
【单选题】以下不是平面定位元件的是:______。