一个车间为了规定工时定额,需要确定加工零件所花费的时间,为此进行了10次试验,测得的数据如下:零件数x(个)102030405060708090100加工时间y (分)6268758189951021
图15是“我国东南某地城乡规划示意图”。读图完成下列问题。 （1）图中①、②、③三地，最适宜建设城市污水处理厂的是 _______ 。 （2）图中甲
— Would you mind if I sing here?— . Look at the sign. It says “Be Quiet”. A. Of course not. B. Better not. C. Not at all. D. I don’t mind.
下列事故处理措施正确的是 ( ) A．金属钠着火，立即用泡沫灭火器灭火 B．在气
下列各项实验操作正确的是 A．使C2H5Br和NaOH溶液混合后水解，取上层清液，滴加AgNO3溶液检验溴元素 B．为增强高锰酸钾溶液的氧化性，可用盐酸将高锰
Close your eyes and think of someone who has hurt you. The offence may be severe or small but deeply painful. He may be a stranger — the driver who caused your accident or someone wh
已知1.505×1023个X气体分子的质量为8g，则X气体的摩尔质量是 A. 16g B. 32g C. 64g /mol D. 32g /mol
Australia’s small population ________, its outstanding performance at the Olympic Games was really amazing and impressive. A. considering B. to be considered C. being c
