{{B}}Water{{/B}} From the beginning, water has furnished man with a source of food and a highway to travel upon. The first civilizations arose{{U}} (51) {{/U}}water was a dominant element in the environment, a challenge{{U}} (52) {{/U}}man’s ingenuity. The Egyptians invented the 365-day calendar in response to the Nile’s annual flooding. The Babylonians, {{U}} (53) {{/U}}were among the most famous law-makers in ancient times, invented laws{{U}} (54) {{/U}}water usage. Water inspired the Chinese to build a 1,000-{{U}} (55) {{/U}}canal, a complex system which, after nearly 2,500 years, remains still practically{{U}} (56) {{/U}}and still commands the astonishment of engineers. But{{U}} (57) {{/U A. miles B. mile C. mile’s D. miles’ [单选题]一台汽轮发电机并于无穷大电网运行,其额定容量SN=31.25MVA,UN=10.5kV,cosψN=0.8(滞后),Xc=7Ω,不计定子电阻,Y接法。发电机额定运行时的过载能力为kM=1.7,则其空载电动势E0为()kV。
(A)9.5 (B)16.4 (C)15.6 (0)14.8
A.A B.B C.C D.D [判断题]除机动车所有权转移到原登记车辆管理所辖区以外和机动车所有人住所迁出车辆管理所辖区以外的变更登记外,已入库的机动车档案原则上不得再出库。
A.正确 B.错误 [判断题]连续中断行车3小时以上4小时以下为一般突发事件B类
A.正确 B.错误 [判断题]检修动力电源箱的支路开关都可不加装剩余电流动作保护器
A.正确 B.错误 [判断题]岩层的原始产状全是水平的。
A.正确 B.错误 [判断题]网页中任何一段文字或者特殊符号都可以被指定为书签。
[填空题]只要是离心式压缩机就有()现象。
[单选题]女,14岁,阵发性腹痛、黑便3天。查体:双下肢可见散在紫癜,双侧膝关节肿胀,活动受限,腹软,右下腹压痛。血象:WBT2.5×109/L,PLT100×109/L。尿常规:蛋白+,RBC+/HP,透明管型0~3个/LP。其诊断可能是:
A.急性阑尾炎 B.肠系膜淋巴结结核 C.急性肾炎 D.急性ITP E.过敏性紫癜 [判断题]作业人员在现场工作过程中,凡遇到异常情况(如直流系统接地等)或断路器(开关)跳闸、阀闭锁时,不论与本身工作是否有关,应立即停止工作,保持现状,待查明原因,确与本工作无关时方可继续工作。( )
A.正确 B.错误 [单项选择]
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