{{B}}
The whale is a warm-blooded, air-breathing animal, giving birth to its young alive, sucking them-and, like all mammals, originated on land. There are many {{U}} (51) {{/U}} of this. Its front flippers (鳍状肢), used for steering and stability, are traces of feet. Immense strength is {{U}} (52) {{/U}} into the great body of the big whales, and in fact most of a whale’s body is one gigantic muscle. The blue whale’s pulling strength has been estimated {{U}} (53) {{/U}} 400 horsepower. One specimen was reported to have towed (拖) a whaling vessel for seven hours at the {{U}} (54) {{/U}} of eight knots (节). An angry whale will {{U}} (55) {{/U}} a ship. A famous example of this was the fate of whaler Essex, {{U}} (56) {{/U} A. heat B. energy C. food D. oxygen [单选题]精密度高的正确度不-定高,正确度高的精密度也不—定高,但精确度高,则精密度与正确度都( )。
A.一样 B.高 C.低 D.不一定 [单选题](单选题,0.6 分)
PCOS 的典型表现是 A.LH/FSH< 1 B.LH/FSH<2 C.LH/FSH<3 D.LH/FSH> 1 E.LH/FSH>2 [填空题]2451.流体通常指(_)和(_)的总称。
[单选题]下列行为中,没有违反《招标投标法》的是( )。
A.评标委员会未经评审,将报价最低的投标人确定为排名第一的中标候选人 B.中标通知书发出后,中标人发觉自己投标报价计算有误,拒绝与招标人签订合同 C.招标人在确定中标人l0天后,向有关行政监督部门提交了招标投标情况的书面报告 D.招标人仅仅向中标人发出中标通知书,而没有将中标结果通知所有未中标的投标人 [判断题]在横向冲刷情况下,管束按三角形排列时叫做错排,管束按方形排列叫做顺排。
[单选题]作业人员进入作业现场应正确佩戴安全帽,还应穿( )、绝缘鞋。
A.绝缘服 B.屏蔽服 C.防静电服 D.全棉长袖工作服 [单选题]单线区段线桥工区应配备的红色信号旗数量为( )。
A.2面 B.4面 C.6面 D.9面 [判断题]助理值班员检查确认列车最后一辆车(如该车辆为规定的自动制动机不起作用的车辆,顺次为前一辆自动制动机良好的车辆)制动活塞伸出并通知司机尾部车辆已制动。
A.正确 B.错误 我来回答: 提交
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