概念分层图是()图。 A.无向无环 B.有向无环 C.有向有环 D.无向有环 发布时间:2018-09-04 19:05 │ 来源:www.tikuol.com 题型:单项选择题 问题: 概念分层图是()图。A.无向无环B.有向无环C.有向有环D.无向有环
题型:单项选择题 At the beginning of class, the noise of desks _______ could be heard outside the classroom. [ ]A. opened and closedB. to be opened and closed C. being opened and closedD. to open and close 查看答案
题型:单项选择题 男性,69岁。咳嗽、痰中带血、消瘦8个月,发热5天。吸烟史51年。X线胸片检查:右肺上叶片状阴影。患者出现上述症状,是由于病变侵犯了().A.膈神经B.喉返神经C.颈交感神经D.臂丛神经E.上腔静脉 查看答案