最早应用于CT检查的部位是()
A.胸部
B.四肢
C.脊柱
D.头颅
E.腹部
参考答案:D
解析:CT最早用于颅脑检查,对颅脑疾病具有很高的诊断价值。
如图所示的是流星在夜空中发出明亮的光焰,此时看到的人有些会在内心里许下一个美好的愿望.有些流星是外太空物体被地球强大引力吸引坠落到地面的过程中同空气发生剧烈摩擦造成的,外太空物体坠落过程中重力势能______(选填“增加”、“不变”或“减少”),机械能______(选填“增加”、“不变”或“减少”).流星同空气摩擦时部分______能转化为______能.
These last few painful moments make me wonder if what my friends told me about college was all true. ①Where are all the beautiful girls I’m supposed to be meeting and talking to in every room? Where are the freedom and relaxed atmosphere my friends bragged about? I’m supposed to be enjoying myself instead of suffering! Everybody seems to have forgotten that college is hard work too. My first days in writing class prove② that delight and pleasure often disappear when assignments are due!
文中②段画线部分正确的翻译是()。
A.快乐和愉悦常常在该交作业的时候消逝得无影无踪。
B.快乐和愉悦常常在有作业的时候消逝得无影无踪。
C.快乐和愉悦常常在作业来临的时候消逝得无影无踪。