温度计插入泵的出、入口插孔内时，应使温度（）插入机油中。
A.尾部过半
B.头部
C.尾部完全
D.尾部小半
参考答案：C
与X线照片影像密度、对比度、清晰度都有关的因素是（）
A.管电流
B.曝光时间
C.摄影距离
D.增感屏
E.水洗时间
—Which of the two computer games did you prefer?
—Actually I didn’t like ______.
A．both of them
B．either of them
C．none of them
D．neither of them
—Which of the two computer games did you prefer?