(4分)化学是一门以实验为基础的学科,请用以下实验装置图回答问题: (1)写出

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问题:

(4分)化学是一门以实验为基础的学科,请用以下实验装置图回答问题:

(1)写出标号为①的仪器的名称            ,若实验室制CO2,应选用      (填序号)作为二氧化碳的发生装置,反应的化学方程式为:                             

(2)若用上述所给的仪器制取H2,则实验室制取H2气体的正确连接顺序为:       接________(填序号),如何用最简单的方法证明H2的密度比空气小:___________________ _______________________________________________________。

考点:氧气的制取和收集氢气的制取和收集二氧化碳的制取和收集实验室制取和收集气体的思路
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B The Beatles甲壳虫乐队
The English rock music group The Beatles gave the 1960s its characteristic musical flavor and (1) a profound influence on the course of popular music, equaled by (2) performers. The guitarists John Winston Lennon, James Paul McCartney, and George Harrison; and the drummer Ringo Starr, were all born and (3) in Liverpool. Lennon and McCartney had played together in a group called The Quarrymen. With Harrison, (4) formed their own group, The Silver Beatles, in 1959, and Starr joined them in 1962. As (5) Beatles, they developed a local following in Liverpool clubs, and their first recordings, "Love Me Do" (1962) and "Please Please Me" (1963), quickly made them Britain’s top rock group. Their early music was (6) by the American rock singers Chuck Berry and Elvis Presley, but they infused a hackneyed musical (7) with freshness, vitality, and wit.
The release of "I Want to Hold Your Hand" in 1964 (8) the beginning of the phenomenon known as"Beatlemania" in the United States. The Beatle’s first US (9) aroused a universal mob adulation. Their concerts were scenes of mass worship, and their records sold (10) the millions. Their first film, the innovative A Hard Day’s Night(1964), was received enthusiastically (11) a wide audience that included many who had never before listened to rock music.
Composing their own (12) , The Beatles established the precedent for other rock groups to play their own music.Experimenting with (13) musical forms, they produced an extraordinary (14) of songs: the childishly simple "Yellow Submarine" ; the bitter social commentary of "Eleanor Rigby" ; parodies of earlier pop styles; new electronic sounds; and compositions that were scored for cellos, violins, trumpets, and sitars, as well as for conventional guitars and drums. The (15) disbanded in 1970, after the release of their final album, Let It Be, and during the 1970s (16) individual careers, On dec.8, 1980, John Lennon (17) fatally shot outside his Manhattan apartment by Mark Chapman, a 25-year-old former mental (18) who, earlier that same day, had asked Lennon for his (19) . Lennon’s murder was universally (20) with an intensity of feeling usually inspired only by political and spiritual leaders.

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药材品种混乱和复杂现象的主要原因有()

A.同名异物和同物异名

B.有的药材本草记载不详

C.有的药材在不同历史时期品种发生了变迁

D.药材栽培措施不当

E.一药多基源情况较为普遍

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肝硬化患者肝肾综合征的发生是由于()

A.肾单位纤维化

B.肾皮质坏死

C.肾髓质坏死

D.功能性的损害

E.胆红素对肾脏的毒性作用

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乡镇企业可按应缴税款减征( )的企业所得税,用于补助社会性开支的费用。

A.5%

B.10%

C.15%

D.20%

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常用的锻件冷却方法有哪些?

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