下列干燥固化方法中,()属辐射加热。A.紫外线固化 B.脉冲辐射固化 C.电子束

题型:多项选择题

问题:

下列干燥固化方法中,()属辐射加热。

A.紫外线固化

B.脉冲辐射固化

C.电子束固化

D.电磁感应固化

考点:机动车维修技术汽车修补工具及设备汽车修补工具及设备题库
题型:多项选择题

当将金属钠溶解在液氨中时,能形成一种蓝色的液氨溶液,蓝色据认为是生成了电子氨化物e(NH3)n-的缘故,其生成可用以下的反应式表示:Na+nNH3=Na++e(NH3)n-,小心蒸去氨气可得白色固体NaNH2,而且有以下反应发生:2Na+2NH3=2NaNH2+H2,下列说法不正确的是[ ]

A.液氨不能发生电离

B.液氨能电离出NH4+和NH2-

C.金属钠的液氨溶液时发生了氧化还原反应

D.金属钠的液氨溶液时蓝色会逐渐褪去

题型:多项选择题

一项工程,甲独做10天完成,乙独做15天完成.写出甲、乙工作效率的比,并化简.

题型:多项选择题
When 16-year-old Ella Fitzgerald stepped onto the stage to perform at Harlem’s Apollo Theater in 1934, she had no idea that her life was about to change. Her childhood had been    36 . After the death of her parents, Fitzgerald had been placed in a boarding school.   37 , the teachers at the school mistreated her,   38  she ran away. Homeless and orphaned, Fitzgerald was trying her best to   39  on the streets of New York City when she won a contest to perform during an amateur night at the Apollo. She had   40  planned to dance, but at the last second, she decided to sing her mother’s favorite song   41 . Her performance earned her   42  from several well-known musicians. Ella Fitzgerald went on to become a   43  jazz singer.
During a musical career that spanned six decades, Fitzgerald   44  more than 200 albums. She won 13 Grammy Awards, the last of which she received in 1990. She worked with some of the greatest American singers of the twentieth century, including Frank Sinatra, Louis Armstrong, Count Basie, and Dizzy Gillespie. Her talent and charm   45  a wide range of listeners around the world. The worldwide   46  of Ella Fitzgerald helped make jazz a more popular genre.
Until the Civil Rights Movement of the 1960s, the United States   47  African American citizens the same treatment   48  white citizens received. Fitzgerald’s manager and her band   49  to perform at places where discrimination was practiced. They also decided not to perform unless they were paid the same   50  as white singers and musicians. Ella’s fight for   51   received support from numerous celebrity admirers, including Marilyn Monroe. Fitzgerald never took her good fortune for granted. She gave money to charities and organizations that contributed to   52  disadvantages children. For her many civic contributions, in 1992 President George Bush   53  her the Presidential Medal of Honor, one of the highest honors   54  to civilians.
In 1991, Fitzgerald gave her   55  performance in New York’s Carnegie Hall. Although Ella Fitzgerald died in 1996, the American “First Lady of Song” continues to live in the hearts and ears of music lovers worldwide.
小题1:
A.rich B.roughC.tiresome D.happy
小题2:
A.ImportantlyB.UnforgettablyC.NaturallyD.Unfortunately
小题3:
A.thereforeB.butC.soD.then
小题4:
A.surviveB.experienceC.learnD.stand
小题5:
A.strangelyB.blindlyC.originally D.probably
小题6:
A.in spiteB.insteadC.in placeD.though
小题7:
A.jealousy B.recognitionC.reputationD.gratitude
小题8:
A.creative B.dependent C.undiscoveredD.distinguished
小题9:
A.releasedB.soldC.copiedD.showed
小题10:
A.compared with B.appealed to C.composed ofD.depended on
小题11:
A.celebrationB.admiration C.relaxationD.indication
小题12:
A.deniedB.supportedC.offeredD.hated
小题13:
A.whichB.whatC.thatD.like
小题14:
A.decidedB.refusedC.startedD.afforded
小题15:
A.numberB.quantityC.amountD.lots
小题16:
A.wealthB.futureC.equalityD.agreement
小题17:
A.caring forB.playing withC.preferring toD.taking after
小题18:
A.rewardedB.awardedC.paidD.presented
小题19:
A.accessibleB.inadequateC.availableD.official
小题20:
A.best B.vividC.openD.final
题型:多项选择题

食管、胃底静脉曲张破裂出血的临床特点为()

A.呕鲜血为主,出血量大

B.出血不易自止

C.易诱发肝性脑病

D.半数病人1~2年内可以再次大出血

E.首次出血的死亡率可高达25%

题型:多项选择题

氧是底壳中含量最多的元素。

(1)氧元素基态原子核外未成对电子数为______个 。

(2)H2O分子内的O-H键、分子间的范德华力和氢键从强到弱依次为__________________________。

的沸点比高,原因是________________________________。

(3)H+可与H2O形成H3O+,H3O+中O原子采用________杂化。H3O+中H-O-H键角比H2O中H-O-H键角大,原因为_________。

(4)CaO与NaCl的晶胞同为面心立方结构,已知CaO晶体密度为ag·cm-3,NA表示阿伏加罗常数,则CaO晶胞体积为_________cm3

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