我国的“嫦娥工程”将按“绕月、落月和驻月”三步进行,计划2012年实验落月探测,

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问题:

我国的“嫦娥工程”将按“绕月、落月和驻月”三步进行,计划2012年实验落月探测,已知月球上无大气、无磁场、无重力。下列各项中,在月球上不能实现的是(   )

A.刻度尺测长度

B.电子停表测时间

C.指南针指示南北方向

D.手电筒照明

考点:磁场、地磁场
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已知∠AOB=90°,过O点引∠AOB所在平面的斜线OC,与OA、OB分别成45°、

60°,则以OC为棱的二面角A—OC—B的余弦值等于______

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下壁心肌梗死出现特征性心电图改变的导联是()

A.V1、V2、V3

B.V7、V8、V9

C.V3、V4、V5

D.Ⅱ、Ⅲ、aVF

E.Ⅰ、aVL、V5、V6

题型:选择题

向井下配电的主变压器中性点是指()

A、变压器一次电缆的地线

B、变压器一次绕组的公共点

C、变压器二次绕组的公共点

D、变压器二次出线电缆的接地线

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Vavaki Vahombe (Pvt) Ltd is a building and construction company operating from a number of sites in Harare. At one such site in the suburb of Hatcliffe there is a signposted warning in bold letters at the front gate of a very dilapidated two storey house where extensive renovations are taking place. The warning reads ‘This building site is private property, no unauthorised persons will be allowed entry, liability will not be accepted by the builders or owners for any injuries sustained by trespassers …’One wet afternoon, Aimless Murombo decided to seek shelter from the gushing winds and rain in one of the rooms on the ground floor of the building after having sneaked in unnoticed. Due to the poor state of the building some bricks fell on him and he sustained severe injuries all over the body. He comes to you for advice as to whether or not the builders are liable for the personal injuries he sustained.Required:Advise Aimless Murombo on the issue of the liability of Vavaki Vahombe (Pvt) Ltd for his personal injuries. (10 marks)

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