高渗性脱水需缓慢纠正高钠血症。()

矫正只适合于()材料零件。

The Story of My Life by Helen Keller is the most __31____(influence) book in my life. It is filled with courage, struggle and faith throughout. Helen Keller was once in deep despair in her __32____, but finally she decided to overcome her physical defects and live happily. Furthermore, she showed great patience__33____ her long and hard learning period.

I have learned, above all, three lessons from her story. First, she taught me that often the road to success is to face hardships __34____(bravety). Maybe you are born under an ill star yet you can stand a better chance _35____ others. It is therefore important that you screw up your courage__36____ courage is needed. Second, the impairment of part of her senses did not stop__37____ learning: on the contrary, she had made continual __38____ to go deeper into the realm of knowledge, and her perseverance had thus helped her overcome many handicaps. __39____, she advised that we should make the most of our sense-organs as if we __40____(lose) them soon because this way we would observe the world more carefully than ever before.

(20分)如图所示，四分之一光滑绝缘圆弧轨道AP和水平绝缘传送带PC固定在同一竖直平面内，圆弧轨道的圆心为O，半径R₀传送带PC之间的距离为L,沿逆时针方向的运动速度v=.在PO的右侧空间存在方向竖直向下的匀强电场。一质量为m、电荷 量 为+q的小物体从圆弧顶点A由静止开始沿轨道下滑，恰好运动到C端后返回。物体与传送带间的动摩擦因数为，不计物体经过轨道与传送带连接处P时的机械能损失,重力加速度为g。

(1)求物体下滑到P点时，物体对轨道的压力F

(2)求物体返回到圆弧轨道后，能上升的最大高度H

(3)若在PO的右侧空间再加上方向垂直于纸面向里、磁感应强度为B的水平匀强磁场 (图中未画出），物体从圆弧顶点A静止释放,运动到C端时的速度为，试 求 物体 在传送带上运动的时间t。

简述微生物修复污染物质的可生物降解性。

招标控制价的编制所涉及的价格应按当时当地（）计算。

A.平均价格水平

B.成本价格水平

C.微利价格水平

D.暴利价格水平