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In the early 1450s cultural change in Europe fueled a growing need for the rapid and cheap production of written documents. Before this time, scribal monks hand-copied sacred texts for centuries. But for the secular world began to develop and 【M1】______ distribute new forms of sacred texts, the scribes could not keep up the demand. Johannes Gutenberg, a goldsmith and businessman 【M2】______ from southern Germany, foresees the profit-making potential for a 【M3】______ printing press that used movable metal type, and borrowed money to develop that we know now as the modern printing press. He 【M4】______ developed his press by combing features of existed technologies: 【M5】______ textile, papermaking and wine presses. Perhaps his most significant innovation, therefore, was the 【M6】______ efficient molding and casting of movable metal type. Gutenberg designed a Latin print Bible which became his most famous work. Despite of the dramatic success of his printing press, 【M7】______ Gutenberg managed to default on a loan and lost his whole printing establishment. His techniques were made publicly and his creditor 【M8】______ won the rights to the proceeds from the Gutenberg Bibles. In 1476, William Caxton set up England's first printing press. Caxton had been a prolific translator and found the printing press to be a marvelousway to expand his mission of promoting unpopular literature, the innovation of the printing press ultimately 【M9】______ influenced art, literature, philosophy and politics. Today, print is thought of as one of the markers of key historical shifts in 【M10】______ communication, creating a social and intellectual transform. 【M1】
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【简答题】在饱和Ca(OH) 2 溶液中,加入NaOH(s),会有白色的Ca(OH) 2 沉淀析出。(    )
【单选题】在一个绝热容器中,放入Ca(OH) 2 悬浊液,有平衡:Ca(OH) 2 (s)?Ca 2+ (aq)+2OH - (aq)△H<0.已知:CaO(s)+H 2 O(l)═Ca(OH) 2 (s)△H<0.下列说法正确的是(  )
A.
向溶液中加少量CaO,达新平衡后,溶液的pH不变
B.
向溶液中加少量CaO,达新平衡后,溶液的pH降低
C.
向溶液中加入Na 2 CO 3 溶液,其中Ca(OH) 2 固体质量增加
D.
向溶液中加入少量NaOH固体,Ca(OH) 2 固体质量不变
【单选题】How many grams of NaOH are required to prepare 400. mL of 3.0 M NaOH solution? M=mol/L, Mr of Na=23, O=16
A.
12 g
B.
48 g
C.
300 g
D.
50g
【单选题】教育部、国家卫生健康委员会等8部门30日联合印发( ),提出了到2030年我国6岁儿童近视率控制在3%左右的目标。实施方案提出,到2023年,力争实现全国儿童青少1.年总体近视率在2018年的基础上每年降低0.5个百分点以上,近视高发省份每年降低1个百分点以上。到2030年,实现儿童青少年新发近视率明显下降、视力健康整体水平显著提升,6岁儿童近视率控制在3%左右,小学生近视率下降到38%以下...
A.
《综合防控儿童青少年近视实施方案》
B.
《全面治疗儿童青少年近视方案》
C.
《综合防控儿童青少年近视具体落实方案》
D.
《综合防控儿童青少年近视率降低目标实施方案》
【单选题】关于静脉管腔内的静脉瓣描述,错误的是
A.
由血管内膜形成,向心开放
B.
可以防止血液逆流
C.
功能不全时常引起静脉曲张
D.
呈半月形袋状
E.
四肢静脉瓣较少
【单选题】下列微粒中,半径大小的顺序正确的是(  )
A.
K + >Ca 2+ >Cl - >S 2-
B.
Ca 2+ >K + >S 2- >Cl -
C.
Ca 2+ <K + <Cl - <S 2-
D.
S 2- <Cl - <K + <Ca 2+
【简答题】在锐角△ABC中, | AB |=2,| CA |=5, S △ABC = 5 3 2 ,那么 AB ? CA =______.
【单选题】关于静脉管腔内的静脉瓣描述,错误是
A.
由血管内膜形成,向心开放
B.
可以防止血液逆流
C.
功能不全时常引起静脉曲张
D.
呈半月形袋状
E.
四肢静脉瓣较少
【单选题】国家卫生健康委员会等8部门30日联合印发( ),提出了到2030年我国6岁儿童近视率控制在3%左右的目标。实施方案提出,到2023年,力争实现全国儿童青少年总体近视率在2018年的基础上每年降低0.5个百分点以上,近视高发省份每年降低1个百分点以上。到2030年,实现儿童青少年新发近视率明显下降、视力健康整体水平显著提升,6岁儿童近视率控制在3%左右,小学生近视率下降到38%以下,初中生近视...
A.
《综合防控儿童青少年近视实施方案》
B.
《全面治疗儿童青少年近视方案》
C.
《综合防控儿童青少年近视具体落实方案》
D.
《综合防控儿童青少年近视率降低目标实施方案》
【判断题】a是完美序列,则Ca(s)=1。()
A.
正确
B.
错误
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