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【简答题】
在数字签名方案中，不仅可以实现消息的不可否认型，而且还能实现消息的（）、（）。
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举一反三
【单选题】What is unusual about the members of the band?
A.
They all play trumpets.
B.
They all play modern jazz.
C.
They are all over seventy.
D.
They are all Southerners.
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【单选题】A.He wants to learn to play the violin.B.His band will perform. next week.
A.
He wants to learn to play the violin.
B.
His band will perform. next week.
C.
He wants to play in the band.
D.
He cant play the violin well.
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【单选题】Polly enjoys ( )in a band in her free time.
A.
play the guitar
B.
to playing the guitar
C.
playing the guitar
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【单选题】What does the title of the passage mean? A.The band wasn’t a famous one. B.The band was formed in a different way. C.The band didn’t play their own music. D.The band wasn’t supported buy his fans.
A.
The band wasn’t a famous one.
B.
The band was formed in a different way.
C.
The band didn’t play their own music.
D.
The band wasn’t supported buy his fans.
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【简答题】是指食品中致病因素进入人体引起的感染性、中毒性等疾病。
查看完整题目与答案
【单选题】( )是指食品中致病因素进入人体引起的感染性、中毒性等疾病。
A.
亚急性疾病
B.
食源性疾病
C.
食物中毒
D.
食品污染
查看完整题目与答案
【单选题】下列各项中,讲述活动的活动重点是( )。
A.
感知理解讲述对象
B.
运用已有经验自由讲述
C.
学习新的讲述经验
D.
巩固和迁移的讲述经验
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【单选题】（）指食品中致病因素进入人体引起的感染性、中毒性等疾病。
A.
食物中毒
B.
食品安全事故
C.
食源性疾病
D.
食品安全事件
查看完整题目与答案
【单选题】Polly enjoys_________the guitar in a band in her free tirne.
A.
play
B.
to play
C.
playing
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【多选题】下列关于电解质溶液的叙述正确的是                    （   ）
A.
常温下，NH 4 Cl与某物质的混合溶液pＨ＜7，则其组成可能是NH 4 Cl与HCl或NH 4 Cl与NH 3 ?H 2 O
B.
将pＨ＝5的氢氟酸溶液稀释后，溶液中所有离子的浓度均降低
C.
常温下，同浓度的Na ２ S与NaHS溶液中所含的粒子种类相同
D.
将一元酸HA溶液与一元碱BOH溶液等体积混合，若所得溶液呈酸性，则混合溶液中离子浓度一定满足：c（B ＋ ）>c（A － ）>c（H ＋ ）>c（OH － ）
查看完整题目与答案
相关题目：
【单选题】What is unusual about the members of the band?
A.
They all play trumpets.
B.
They all play modern jazz.
C.
They are all over seventy.
D.
They are all Southerners.
查看完整题目与答案
【单选题】A.He wants to learn to play the violin.B.His band will perform. next week.
A.
He wants to learn to play the violin.
B.
His band will perform. next week.
C.
He wants to play in the band.
D.
He cant play the violin well.
查看完整题目与答案
【单选题】Polly enjoys ( )in a band in her free time.
A.
play the guitar
B.
to playing the guitar
C.
playing the guitar
查看完整题目与答案
【单选题】What does the title of the passage mean? A.The band wasn’t a famous one. B.The band was formed in a different way. C.The band didn’t play their own music. D.The band wasn’t supported buy his fans.
A.
The band wasn’t a famous one.
B.
The band was formed in a different way.
C.
The band didn’t play their own music.
D.
The band wasn’t supported buy his fans.
查看完整题目与答案
【简答题】是指食品中致病因素进入人体引起的感染性、中毒性等疾病。
查看完整题目与答案
【单选题】( )是指食品中致病因素进入人体引起的感染性、中毒性等疾病。
A.
亚急性疾病
B.
食源性疾病
C.
食物中毒
D.
食品污染
查看完整题目与答案
【单选题】下列各项中,讲述活动的活动重点是( )。
A.
感知理解讲述对象
B.
运用已有经验自由讲述
C.
学习新的讲述经验
D.
巩固和迁移的讲述经验
查看完整题目与答案
【单选题】（）指食品中致病因素进入人体引起的感染性、中毒性等疾病。
A.
食物中毒
B.
食品安全事故
C.
食源性疾病
D.
食品安全事件
查看完整题目与答案
【单选题】Polly enjoys_________the guitar in a band in her free tirne.
A.
play
B.
to play
C.
playing
查看完整题目与答案
【多选题】下列关于电解质溶液的叙述正确的是                    （   ）
A.
常温下，NH 4 Cl与某物质的混合溶液pＨ＜7，则其组成可能是NH 4 Cl与HCl或NH 4 Cl与NH 3 ?H 2 O
B.
将pＨ＝5的氢氟酸溶液稀释后，溶液中所有离子的浓度均降低
C.
常温下，同浓度的Na ２ S与NaHS溶液中所含的粒子种类相同
D.
将一元酸HA溶液与一元碱BOH溶液等体积混合，若所得溶液呈酸性，则混合溶液中离子浓度一定满足：c（B ＋ ）>c（A － ）>c（H ＋ ）>c（OH － ）
查看完整题目与答案