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【单选题】
患者男性，40岁，车工。因近两月来经常加班劳动而引起腰背痛及活动障碍，约5日前又扭伤腰部，疼痛加剧，且向右下肢后侧放射，每于弯腰、咳嗽及用力排便时加重，脊髓造影显示 L4、5间偏右有一圆形压迹，最可能的诊断是A.
劳累性腰痛
B.
慢性腰部损伤
C.
性脊柱炎
D.
腰部肌筋膜炎
E.
腰椎间盘突出症
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【单选题】Science is a dominant theme in our culture. Since it touches almost every facet of our life, educated people need at least some acquaintance with its structure and operation. They should also have an ...
A.
cultural groups that are formed by scientists
B.
people whose knowledge of science is very limited
C.
the scientific community
D.
people who make good contribution to science
【多选题】在Linux操作系统上,可以使用passwd命令来修改密码。请问在如下有关修改密码的陈述中,哪两个是不正确的?
A.
一个普通用户可以将自己的password改为miao
B.
一个普通用户不能将自己的password改为miao
C.
root 用户可以将自己的password改为miao
D.
root用户不能将其他用户的password改为miao
E.
root用户可以将其他用户的password改为miao
【单选题】___是后继生产的一款低功耗芯片,其工作在2.4GHz的频道上是一款完全 符合IEEE 802.15.4协议规范的芯片。
A.
CC2420
B.
80C51
C.
80C52
D.
87C52
【简答题】74LS161 是同步 4 位二进制加法计数器,其逻辑功能表如下,试分析下列电路是几进制计数器,并画出其状态图。
【单选题】Science is a dominant theme in our culture. Since it touches almost every facet of our life, educated people need at least some acquaintance with its structure and operation. They should also have an ...
A.
cultural groups that are formed by scientists
B.
people whose knowledge of science is very limited
C.
the scientific community
D.
people who make good contribution to science
【简答题】Science is a dominant theme in our culture.Since it touches almost every facet of our life, educated people need at least some acquaintance with its structure and operation.They should also have an un...
【简答题】如图 所示为同步 4位二进制加法计数器74LS161组成的计数器电路。试分析: ( 1)清零端 是(同步/ 异步) 清零? ( 2)置数端 是 (同步/ 异步) 置数? ( 3)该计数电路是 进制,计数范围是 至 ( 阿拉伯数字表示)
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