【单选题】A: Is it far from here?B: It's ________ from here.
【判断题】( )外来原始凭证是企业与外单位发生经济业务时,由外单位的经办人员填写。
【单选题】—Is it far from here to the supermarket? —No, it's only about _____. [ ]
【单选题】— Is it far from here? — ____________, it's not far. [ ]
【单选题】Is it far from here?
C.
Don’t bother. I’ll call back later
D.
It takes twenty minutes to walk there.
【单选题】对滤过板的错误描述是( )
B.
滤过板以降低剂量率,延长治疗时间为代价而提高平均能量
D.
使用复合滤过板,从射线窗口向外,先放原子序数低的后放高的
E.
低能X线,滤过板材料为铝,能量较高时,材料为铜