施工企业对于（）分包方的选择可重点考查其资质、服务人员的资格、设备完好程、提供技术资

绝对值等于5的数是[ ]

A．5

B．﹣5

C．+5或﹣5

D．0和5

许多房间都装有玻璃窗。在闷热的夏天开着空调的甲房间和寒冷的冬天开着暖气的乙房间，玻璃窗上都会出现“水雾”。下列关于“水雾”是在玻璃窗的哪一面的说法中正确的是

A．甲、乙两房间，“水雾”都在内表面

B．甲、乙两房间，“水雾”都在外表面

C．甲房间“水雾”在外表面，乙房间“水雾”在内表面

D．甲房间“水雾”在内表面，乙房间“水雾”在外表面

金币、银币、铜币等货币在我国历史上曾发挥过重要的作用。在一位收藏家的家中，陈列了很多金属货币。

（1）其中有些货币表面是黑色，且有少量的绿色锈状物，则这肯定是     币，黑色物质是           ，形成这种物质的化学方程式为                               ，绿色物质是       ，形成这种物质的化学方程式为                               。要除去这些物质应选用          ，发生反应的离子方程式为                         ，充分反应后，这枚金属币的真面目为        色。

（2）其中一枚是闪闪发光的黄色金属币，它肯定是      币，表面一直未被氧化的原因是        。

（3）若将金币、银币、铜币分别放到稀硝酸中浸泡，能溶解的是         ，不溶解的是        ，写出溶解时的化学方程式                                            ，若想溶解不能被硝酸溶解的钱币，则选用            。

圆的直径是4厘米，它的周长是______厘米，它的面积是______平方厘米．

With your workload growing, you may be telling yourself a vacation is one luxury you can’t afford.  小题1: A vacation allows you the opportunity to recharge your physical and motional batteries, disconnect from everyday concerns, and return to work rested and refreshed. Some facts have proved employees are more productive after a vacation than before one. Here are some tips for you to plan your vacation to make sure that your time away from the office is worry free.

Time is right. A Robert Half survey shows that July and August are the most favorable months for employees to take a break because these months offer ideal beach weather and many businesses slow down during this time.  小题2: For instance, if a big task is planned for the summer, you may consider postponing your trip until the fall.

Ask others for assistance.  小题3: Your supervisor can help you determine who is the most qualified for a particular task.

Let your contacts know. Give colleagues and customers you frequently work with a few weeks’ notice before you start off.  小题4:

Conduct a technical review. Before you leave, make sure there is plenty of room in your e-mail inbox so you don’t exceed (超越) your storage limit while you’re out of the office, which might prevent you from sending messages when you return.  小题5:

In short, taking vacation is necessary and beneficial for your job. But you must plan your vacation properly in order to work free and worry free on holiday.

A．Ask trusted colleagues to handle your projects while you’re away.

B．A summertime beach vacation includes so much more than what you desire these days.

C．But the truth is that you can’t afford not to take one.

D．This will give them enough time to plan for your absence.E. Also make sure passwords won’t expire(期满) while you are away.

F. What’s more, find your pet a temporary home when you are on vacation.

G. When planning your vacation, remember to take into account any activity that your department will be focused on during that time.