在交流电路中视在功率就是电源提供的总功率，它等于有功功率与无功功率之各和。

河姆渡居民已经会[ ]

A．制作简单的玉器和原始乐器

B．制造黑陶、白陶

C．制造铜器

D．制造铁器

《建设工程质量管理条例》所指的建设工程包括______。

A．装饰工程

B．线路管道

C．设备安装

D．土木工程

2006年世界锂离子电池总产量超过25亿只，锂电池消耗量巨大，对不可再生的金属资源的消耗是相当大的。因此锂离子电池回收具有重要意义，其中需要重点回收的是正极材料，其主要成分为钴酸锂

(LiCoO₂)、导电乙炔黑（一种炭黑）、铝箔以及有机粘结剂。某回收工艺流程如下：

(1)上述工艺回收到的产物有________

(2)废旧电池可能由于放电不完全而残留有原子态的锂，为了安全对拆解环境的要求是____________。

(3)碱浸时主要反应的离子方程式为____________________

(4)酸浸时反应的化学方程式为____________________。如果用盐酸代替H₂SO₄和H₂O₂的混合液也能达到溶解的目的，但不利之处是________________

(5)生成Li₂CO₃的化学反应方程式为____________________。已知Li₂CO₃在水中的溶解度随着温度升高而减小，最后一步过滤时应________________

沉香横切面镜检可见（）

A.中柱鞘内含晶纤维

B.薄壁细胞含草酸钙柱晶

C.薄壁细胞含草酸钙针晶

D.皮层细胞含草酸钙砂晶

E.薄壁细胞含草酸钙簇晶

Ink-jet printer belongs to nonimpact printers in which the characters are formed by projecting particles or droplets of ink on to paper. (71) printer is also a n0nimpact printer in which the characters are produced by applying hot elements to heat-sensitive paper directly or by melting ink from a (72) on to plain paper. Electrostatic printer creates an electrostatic latent image, which is then made visible by a toner and transferred and fixed on paper. An electrostatic printer may be used in some instances as a (73) . Laser printer creates, by means of a laser beam directed on a (74) surface, a latent image which is then made visible by a toner and transferred and fixed on paper. Magnetographic printer creates, by means of magnetic heads operating on a metallic drum, a latent image which is then made visible by a toner and transferred and fixed on paper. Computer-output-microfilm (COM) printer produces on a photographic film a (75) of each page.

（71）处填（）。

A．Hot

B．Warm

C．Heat

D．Thermal