星等
参考答案:
对于从恒星或其他发光天体接收到的光线的数量的一个衡量标准。
Andrew is the owner of a coffee bar in Pretoria. He agreed to purchase a food vending machine from Ben and signed the contract without reading its terms. The contract contained an exemption clause excluding liability for all kinds of defects in the machine. The machine proved to be totally defective. Andrew purported to terminate the contract and also maintains that the contract is in conflict with what he and Ben orally had agreed on.Required:Advise Andrew as to whether or not he would succeed. (10 marks)
在人们的生产和生活中,经常要对物质进行分类.下面已将现有物品分成了两类:①铅笔芯、铝质易拉罐、水银 ②橡皮擦、塑料笔套、玻璃板.这两类物品分别属于( )
A.导体和绝缘体
B.金属和非金属
C.磁性材料和非磁性材料
D.晶体和非晶体