| Today, most countries in the world have
canals. Some canals, such as the Suez or the Panama, {{U}} (31)
{{/U}}ships weeks of time by making their voyage a thousand miles shorter.
Other canals permit boats to reach cities that are not located on the coast.
{{U}} (32) {{/U}}other canals drain lands where there is too much water,
help or{{U}} (33) {{/U}}fields where there is not enough
water. The{{U}} (34) {{/U}}of a canal depends on the kind of boats going through it. The canal must be wide enough to permit two of the{{U}} (35) {{/U}}boats using it to{{U}} (36) {{/U}}each other easily. It must be deep enough to leave about two feet of water{{U}} (37) {{/U}}the keel of the largest boat using the canal. Some canals have sloping sides, while others have sides that are nearly{{U}} (38) {{/U}}. Canals that are cut through rock can ha A. collide B. corrupt C. crumble D. deteriorate [单选题]空调票的起码票价里程为（）km。
A.20 B.100 C.400 D.200 [判断题]同杆塔架设的多回线路中部分线路停电或直流线路中单极线路停电检修，在工作人员对带电导线最小距离小于表3规定的安全距离时，经工作负责人同意即可进行。
A.正确 B.错误 [单选题]在一种均匀的材料中,如果距表面25mm深度处的纵波速度为0.625 cm /微秒,则距表面50mm深度处的纵波速度为----------( )
A.25 mm深度处声速的1/4; B.25mm深度处声速的1/2; C.与25mm深度的声速相同; D.以上都不是; [不定项选择]热力管道的补偿器安装中，补偿器悬壁的长度偏差不应大于（）mm。
A. ±5 B. ±8 C. ±9 D. ±10 [判断题]两个同型号、同变比的CT串联使用时，会使CT的励磁电流减小。( )
A.正确 B.错误 [单选题]党员个人服从(),少数服从多数,下级组织服从上级组织,全党各个组织和全体党员服从党的全国代表大会和中央委员会,这是党的民主集中制的基本原则之一。( )
A.党的组织 B.党委主要领导 C.行政主要领导 D.党政领导 [单项选择]钢轨磨耗常见于轨道线路的（）地段。
A. 正线 B. 停车线 C. 曲线 D. 渡线 [判断题]建国后，随着土地改革在全国范围内的基本完成，中国国内的主要矛盾即是工人阶级与民族资产阶级的矛盾。
A.正确 B.错误 我来回答: 提交
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