【单选题】Tabor made his first fortune
A.
by supplying two prospective miners and getting in return a one-third interest in the findings
B.
because he was persuaded by the two miners to quit supplying
C.
by buying the shares of the other
【单选题】支气管扩张患者在施行体位引流时,错误的护理是
【判断题】凡是含孔材料,其干表观密度均比其密度小。
【单选题】物体通过两个连续相等位移的平均速度分别为v1=m/s、v2=15 m/s,则物体在整个运动过程中的平均速度是( )
【判断题】( )预应力钢丝的张拉力,一般用油泵读数校核。
【简答题】物体通过两个连续相等的位移的平均速度大小分别为v1=10m.s -1 和v2=15m.s -1 .若物体作直线运动, 则整个运动中物体的平均速度大小为 .
【判断题】凡是含孔材料,其表观密度均比密度小。( )