下列说法不正确的是（ ） A．煤是化石燃料 B．用于奥运“祥云”火炬的丙烷是一 发布时间：2017-08-11 14:00 │ 来源：www.tikuol.com 题型：选择题 问题： 下列说法不正确的是（ ）A．煤是化石燃料B．用于奥运“祥云”火炬的丙烷是一种清洁燃料C．乙烯是高分子化合物D．蛋白质、糖类、脂肪和水等都是营养素
题型：选择题 The telephone rings and Sue answers it." 1 I speak to Mrs. Potts, please?" a man asks. "I'm afraid you've got the wrong 2 ," Sue says. "I'm sorry," the man says. A few minutes later the telephone rings 3 . Sue 4 it. It is the same man. He makes a mistake again. Three minutes 5 the telephone rings once more, but she 6 answer it this time, It rings and rings. Her mother hears the 7 ."Why 8 you answer the phone, Sue? she calls. "Oh, all right," Sue says."I'm sure it's that man again." But she is 9 . It is her father and he is very 10 . Sue keeps him waiting. （ ）1. A. Shall （ ）2. A. number （ ）3. A. more （ ）4. A. gets （ ）5. A. ago （ ）6. A. goes to（ ）7. A. sound （ ）8. A. do （ ）9. A. right （ ）10. A. happy B. Do B. telephone B. again B. makes B. before B. would like B. voice B. don’t B. correct B. hungry C. Must C. person C. back C. answers C. later C. can’t C. noise C. can C. wrong C. angry D. May D. place D. soon D. gives D. past D. doesn’t D. telephone D. can’t D. foolish D. tired 查看答案
题型：选择题 胶片感光性能参数的叙述，不正确的是A．产生密度1.0所需曝光量的倒数B．反差系数指照片对比度与射线对比度之比C．曲线的平均斜率是直线部分的斜率D．最大密度指胶片密度上升到一定程度，不再因曝光量的增加而上升E．宽容度是诊断密度0.25～2.0所对应的曝光量范围 查看答案
题型：选择题 根据钢结构设计规范（GB50017-2003），按塑性设计时，钢材的力学性能应满足强屈比fu/fy≥（），伸长率δS≥（）。A.1.0；15B.1.2；15C.1.2；20D.1.0；20 查看答案