试问图示中[tex=6.071x1.286]GZbiT2P8T8KVyVUEWQpYyjIiVTkGekbnZrmhPI/Gp54=[/tex]点的测压管高度，测压管水头。（[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]点闸门关闭，以[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]点所在的水平面为基准面）[img=423x404]17aaed85aada286.png[/img]
举一反三
- 过点[tex=0.643x1.0]fYkALuFzYlFm0R716i1EGA==[/tex]作一直线与[tex=1.429x1.0]DZcwY2TNV/IV6o1LFpBZgA==[/tex]相交于[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]点,使点[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]距[tex=0.857x1.0]h610M+sGyf59WggKwaDo1Q==[/tex]面为[tex=2.786x1.0]ykol39dh/YVnSriIGbGc8Q==[/tex]。[img=363x385]17ab8ef6eace774.png[/img]
- 过点[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]作平面平行已知平面。[img=437x409]17ab933ff45307b.png[/img]
- 设[tex=2.857x1.357]oni5YFYZg9r1D8AXbqLQGA==[/tex]在平面有界闭区域[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]上具有连续的二阶偏导数，且满足[tex=4.214x2.714]Hvc3DRViYQYrFC7OWnSXUx/KmzK/fvn3ahKFrBFpVwzUTtyDtqkK3dfzr4h3JG1V8x8LvgKCg/EPBk9HA8EbhA==[/tex]及[tex=6.143x2.714]Hvc3DRViYQYrFC7OWnSXUx/KmzK/fvn3ahKFrBFpVwxvvMDwtBjq2btZle+UW18Buhrn5mk7fxtcCU9U2d4rQFg/Rmzp7N0mS8vm5DGOJno=[/tex]，则[tex=2.857x1.357]fs81OYo2b1zExBdfT8crHg==[/tex]的(A).最大值点和最小值点必定都在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的内部;(B).最大值点和最小值点必定都在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的边界上;(C).最大值点在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的内部，最小值点在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的边界上;(D).最小值点在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的内部，最大值点在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的边界上.
- 结构分别承受两组荷载作用，如图[tex=1.929x1.286]+A91pi2VXLtyYrVQoi0TLA==[/tex]所示，下列等式中哪些是正确的?各位移以与相应广义力指向一致为正。[img=728x191]179cc56b9ed8e72.png[/img](1)图[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]中[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]截面的转角一图[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]中[tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]点的水平位移;(2)图[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]中[tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]点的水平位移=图[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]中[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]截面的转角;(3)图[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]中[tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]铰两侧截面相对转角=图[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]中[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]点的水平位移;(4)图[tex=0.571x0.786]c59+3vo0/Vn/FvNRhDRu5g==[/tex]中[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]点水平位移=图[tex=0.429x1.0]JThLUuJ8WswSAPiYZWihWg==[/tex]中[tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]铰两侧截面相对转角。
- 求图[tex=1.0x1.0]Yr2e2KsL8KeUNhWQSLXAew==[/tex]所示刚架中[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]点的水平位移，已知[tex=1.214x1.0]aXJNSgwe9sYfky/Vv9M4JQ==[/tex]为常数。[img=241x154]179ccd7989a4b77.png[/img]