It’s sports time.Most students in Class 1 are playing football on the playground. A.boy B.boys C.boy’s D.boys’
下列现象与电化学腐蚀无关的是A．黄铜（铜锌合金）制作的铜锣不易产生铜绿 B．生铁比软铁芯（几乎是纯铁）容易生锈C．铁质器件附有铜质配件，
实验室用下列两种方法制氯气：①用含HCl 146 g的浓盐酸与足量的MnO2反应；②用87 g MnO2与足量浓盐酸反应。所得的氯气
Premier Wen Jiabao said that if we worked hard and____ optimistic,we were_____ win the war against the finanical crisis. A. were; bounding B. were; bound to C.was; bounding to D.had; b
6．隋朝将作大匠宇文凯曾严令：官府工匠不得入市工作，其晚年回乡后亦受到严密监视且不许“收授学徒”和“制作产品”。上述现象反映了( ) A．官
People should thank the firefighters for the things they do to prevent fires_______the environment safer. A. make B. to make C.
如表是某学习小组测量的小伟同学的胸围长度（cm），则该同学的胸围差是( ) A．13.6cm B．10.3cm C．12.3cm D．12.6cm
