【单选题】This passage is written mostly probably for those ______.
A.
taking wreck diving as a sport
B.
specializing in wreck research
C.
focusing on shipwreck archaeology
D.
interested in marine medical science
【判断题】任何电荷在电场中都要受到电场力的作用。( )
【判断题】旋转特征中的旋转轴可位于与草图绘制平面垂直的平面上( )。
【判断题】把一个试验电荷放到电场里,试验电荷就会受到力的作用,这种力称为电场力。( )
【判断题】旋转特征中的旋转轴可位于与草图绘制平面垂直的平面上
【单选题】Prior to the availability of enterprise EDM, locating a document over a LAN could be difficult, and over a WAN(66)nearly impossible. With the model for collaborative work spreading, and with more user...
【判断题】旋转特征中的旋转轴可位于与草图绘制平面垂直的平面上( )。
【判断题】电场力可以对电荷做功,说明电场具有能量。 ( )