【判断题】在做动物照影实验时要穿铅衣来防止辐射。()
【单选题】There ____(be) a sudden pull at the pole and a fish was caught.
【判断题】Jf2B4309操作票上的操作项目必须填写双重名称,即设备的名称和位置。
【单选题】In such cases, either chemical methods of separation with the general techniques of chemical analysis must be applied in order to eliminate the interfering effects of these constituents or, as is comm...
【单选题】The fish was caught _______.