【单选题】汽车行驶的必要充分条件是
A.
1、汽车的牵引力必须大于所有阻力之和: Ft≧Ff+Fw+Fi+Fa 阻力主要有:摩擦阻力,空气阻力,坡道阻力,加速阻力 2、牵引力应小于或等于地面对车辆的附着力 : F牵≤F附
B.
1、汽车的牵引力必须小于或等于所有阻力之和: Ft≤ Ff+Fw+Fi+Fa 阻力主要有:摩擦阻力,空气阻力,坡道阻力,加速阻力 2、牵引力应小于或等于地面对车辆的附着力 : F牵≤F附
C.
1、汽车的牵引力必须小于或等于所有阻力之和: Ft≤Ff+Fw+Fi+Fa 阻力主要有:摩擦阻力,空气阻力,坡道阻力,加速阻力 2、牵引力应大于或等于地面对车辆的附着力 : F牵≧F附
D.
1、汽车的牵引力必须大于或等于所有阻力之和: Ft≧Ff+Fw+Fi+Fa 阻力主要有:摩擦阻力,空气阻力,坡道阻力,加速阻力 2、牵引力应大于或等于地面对车辆的附着力 : F牵≧F附
【单选题】What the organizer of Miss Digital World wants to do next is______.
A.
to sell pictures of beauties for calendars
B.
to hold another contest
C.
to put the digital beauties into practical use
D.
to start an advertising company
【简答题】完形填空。 The concept of solitude (独处) in the digital world is almost non-existent. In the world of digital technology, e-mail, social networking and online video s, information is meant to be 1 . Sol...
【单选题】某急性白血病患者在化疗期,近一天尿量1 000ml/24h,此时的护理措施最重要的是
A.
嘱患者多饮水,每日尿量大于1 500ml,必要时遵医嘱输液
【单选题】某急性 白血病 患者在化疗期,近一天尿量 1000ml/24h ,此时的护理措施最重要的是
A.
嘱患者多饮水,每日大于 1500ml ,必要时遵医嘱输液
【单选题】Uber is a digital company that builds products that the digital world and the physical world.
【简答题】Today, people are living in a digital world which brings about a fast evolution of technology in daily life, such as digital photos, digital computers, digital books, etc. Nearly everything can be sim...