班级中，我们每个人都要[ ] ①各尽其能，发挥所长 ②争名夺利，满足自己 ③限制

近年来，某县为发展教育事业，加大了对教育经费的投入，2009年投入6000万元，2011年投入8640万元．

（1）求2009年至2011年该县投入教育经费的年平均增长率；

（2）该县预计2012年投入教育经费不低于9500万元，若继续保持前两年的平均增长率，该目标能否实现？请通过计算说明理由．

某工程施工时需将施工船舶和沉箱从甲港拖运至乙港，甲、乙两港海上距离90海里，拖航时平均波高H为2m．并且两港都在渤海湾东岸，拖运航线距岸不超过20海里。该工程的A型沉箱尺寸为18.35m×15.0m×17.9m（长度×宽度×高度），沉箱稳定平衡压载后的总重为30336KN，沉箱吃水T为10.85～11.08m。沉箱拖航拖力计算公式为：F=A×γ_w×K×V²/2g式中：F--拖带力（kN）；A--沉箱受水流阻力的面积（m²），A=a×（T+δ）；γ_w--海水的重度（kN）；a--沉箱宽度（m）；T--沉箱吃水（m）；a--沉箱前涌水高度（m），取0.6倍平均波高；V--沉箱对水流的相对速度（m/s），取1.55m/s；K--挡水形状系数，取1.0；g--重力加速度（m/s²）。

船舶拖运调遣宜投保哪几种保险？船舶的海损事故有哪些？

列式计算 （1） 5 9 与 4 15 的差乘以 5 13 与 7 26 的和，积是多少？ （2）1减去 4 9 与 3 8 的积，再除以 1 3 ，商是多少？

属缺陷病毒的是（）

A.流感病毒

B.轮状病毒

C.丁肝病毒

D.HIV

E.登革病毒

Tidiness

Tidiness means keeping things out of sight and yet available when wanted. It implies that there is a (1) for everything and that each thing used finds its way (2) to its place by a continuos process, not by a spasmodic (3) . The process depends, however, upon the drawer, cupboard and storage (4) being provided, for lack of which one things may literally have (5) place to go. Like the perambulator and trolley, the luggage and the golfclubs (6) be homeless. The same may be true of the deck-chairs (7) the bulkier plastic toys. As there is no place for them, it is no (8) telling people to put them away. The architect who thus economises on (9) space is apt to claim that a good-sized sitting-room is (10) result. What advantage is there in that, however, (11) half the living-room has to be used for storage The aesthetic (12) depends, in turn, upon storage space. (13) it may be true that no house ever had cupboards enough, (14) are some houses which have practically no cupboards (15) all. In these our choice must lie between chronic (16) and ruthless destruction. That is not to say, however, (17) cupboard space will itself create tidiness. Some people (18) happier, it would seem, in chaos. There is the question, furthermore, (19) the cupboards themselves are tidy. That (20) has been swept out of sight is no proof, in itself, that everything can be found.