多项选择题 为明确诊断,以下哪种检查方法对肾盂病变鉴别诊断有价值: ()

单项选择题 This film Schindler’s List has achieved a great success. It has won ______ Oscar Awards out of twelve nominations.

单项选择题 理想气体在喷管内流动的过程中，温度越来越低。