2007年7月我国颁布实施了新的饮用水国家标准。目前，饮用水安全问题依然存在。根

初中化学实验常用仪器的用途及注意事项．

仪器	用途	注意事项
试管	用作______（填“多量”或“少量”）试剂的反应容器，在常温或加热时使用	加热后不能骤冷，防止炸裂
试管夹	用于夹持______	防止烧损或腐蚀
玻璃棒	用于搅拌、______或转移液体	搅拌时不可用力过猛，勿碰击器壁
酒精灯	用于加热	禁止向燃着的酒精灯中添加酒精；禁止用燃着的酒精灯去引燃另一盏酒精灯；用完酒精灯后必须用______盖灭；应用酒精灯的______焰进行加热
胶头滴管	用于吸取和______少量液体	用过后立即清洗，再去吸取其他药品
滴瓶	用于盛放______（填“固体”或“液体”）药品	滴瓶上的滴管与滴瓶配套使用
铁架台（包括铁夹和铁圈）	用于______和支持各种仪器，一般常用于过滤、加热等操作	铁夹和十字夹位置要向上，以便于操作和保证安全；重物要固定在铁架台底座大面一侧，使中心落在底座上
烧杯	用作配制溶液和较大量试剂的反应容器，在常温和加热时使用	加热时应放置在______上，使受热均匀
量筒	量取______（填“固体”或“液体”）体积	不能加热，不能用作反应容器
集气瓶	用于______或贮存少量气体	收集或贮存气体时，______

电网测量用电压互感器二次侧额定电压为（）V。

A.220

B.380

C.66

D.100

象形文字

什么是滚塑？

Tidiness

Tidiness means keeping things out of sight and yet available when wanted. It implies that there is a (1) for everything and that each thing used finds its way (2) to its place by a continuos process, not by a spasmodic (3) . The process depends, however, upon the drawer, cupboard and storage (4) being provided, for lack of which one things may literally have (5) place to go. Like the perambulator and trolley, the luggage and the golfclubs (6) be homeless. The same may be true of the deck-chairs (7) the bulkier plastic toys. As there is no place for them, it is no (8) telling people to put them away. The architect who thus economises on (9) space is apt to claim that a good-sized sitting-room is (10) result. What advantage is there in that, however, (11) half the living-room has to be used for storage The aesthetic (12) depends, in turn, upon storage space. (13) it may be true that no house ever had cupboards enough, (14) are some houses which have practically no cupboards (15) all. In these our choice must lie between chronic (16) and ruthless destruction. That is not to say, however, (17) cupboard space will itself create tidiness. Some people (18) happier, it would seem, in chaos. There is the question, furthermore, (19) the cupboards themselves are tidy. That (20) has been swept out of sight is no proof, in itself, that everything can be found.