在Word编辑状态下，通过( )可以选中整个文档内容。 A．Ctrl+B B．在选

水准测量中，在中转点要使用尺垫，而在水准点上不使用尺垫。( )

如图所示，质量为m的物体A静止在地面上，上表面带有弯钩．一把弹簧秤连接有挂钩的拉杆和弹簧相连，并固定在外壳一端O上，外壳上固定一个提环．可以认为弹簧秤的总质量集中在外壳上为m₀，弹簧和拉杆质量忽略不计，弹簧的劲度系数为k．手拿弹簧秤的提环，秤钩钩住物体A，秤体保持竖直，开始弹簧没有形变，示数为零．现竖直向上缓慢提起，当提环提升距离L₁时，A刚要离开地面，此过程手做功W₁、手做功的平均功率为P₁；若加速向上提起，提环上升的距离为L₂时，A刚要离开地面，此过程手做功W₂、手做功的平均功率为P₂．假设弹簧秤示数一直在量程范围内，则（　　）

A．L₁=L₂=

B．W₂＜W₁

C．P₂＜P₁

D．第一次A刚要离开地面时，弹簧秤读数等于（m+m₀）g

British people are far more sophisticated about beverages than they were 50 years ago. Witness the Starbucks revolution and you’ll know where (1) goes. However, spurred on by recent studies suggesting that it can cut the risk of (2) and retard the aging process, tea is enjoying a (3) .

Although tea is available in more places than ever, it remains to be (4) of a typical British family.

If you are invited to an English home, (5) in the morning you get a cup of tea. It is either brought in by a heartily (6) or an almost malevolently silent maid. When you are (7) in your sweetest morning sleep you must not say: "Go away, you (8) ." On the contrary, you have to declare with your best five o’clock smile. "Thank you very much. I (9) a cup of tea, especially in the morning." If they leave you alone with the liquid you may pour it (10) !

Then you have (11) ; then you have tea at 11 o’clock in the morning; (12) ; then you have tea for tea; then after supper; and again at eleven o’clock (13) .

You must not refuse any additional cups of tea under the(14) if it is hot; if it is cold; if you are (15) ; if you are nervous; if you are watching TV; (16) ; if you have just returned home; if you feel like it; if you do not feel like it; if you have had no tea (17) ; if you have just had a cup.

You definitely must not (18) . I sleep at five o’clock in the morning; I have coffee for breakfast; I drink innumerable (19) during the day; I have the (20) even at tea-time!

3（）

广告效果比率法包括哪几种？（）

A.广告销售效果比率

B.广告销售利润比率

C.市场占有率

D.广告费比

危险化学品安全技术

剧毒品的发运要按《条例》规定：委托有资质认定的运输企业、通过公路运输剧毒化学品的，托运人应当向( )的县级人民政府公安部门申请办理剧毒化学品公路运输通行证。

A．托运单位注册

B．始发地

C．目的地

D．途经地