A:某醋酸溶液的pH=a,将此溶液稀释1倍后,溶液的pH=b,则a>b
B:在滴有酚酞溶液的氨水中,加入NH4Cl至溶液恰好无色,则此时溶液的pH<7
C:1.0×10-3 mol/L盐酸的pH=3.0, 1.0×10-8 mol/L盐酸的pH=8.0
D:若1 mL pH=1的盐酸与100 mL NaOH溶液混合后,溶液的pH=7,则NaOH溶液的pH=11
《登州府志》记载,“纺织花布,以自衣被。穷乡山陬(zōu,山脚),无问男妇为之,其织作须织工。勤有余布,亦兼鬻(yù,卖)于乡市,复有布贾贩之城市”。这反映出当时登州( )①自然经济解体 ②家庭手工业发展 ③商品经济发展 ④出现经济区域分工
【旅游地理】
下图为云南省精华旅游线路示意图,游览线路次序为昆明一景洪一保山一大理一一丽江~香格里拉~德钦一(返回)昆明,本线路所游览的景点包括世界遗产2处(全省共3处),国家级风景名胜区7处(全省共12处),云南省重点景区8处(全省共9处)。读图文资料回答问题。
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“ Dreams may be more important than sleep. We all need to dream.” some scientists say. Dreams take up about one quarter of our sleeping time. People have several dreams each night. Dreams are like short films. They are usually in color. Some dreams are like old films. They come up over and over again. That may be the dreamer worrying about something. Dreaming may be a way of trying to find an answer. Some people get new ideas about their work from dreams. They may have been thinking about their work all day. These thoughts can carry over into dreams. Too much dreaming can be harmful. The more we sleep,the longer we dream. The mind is still at work when we dream. That is why we may have a long sleep and still wake up tired.