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【简答题】
PDAs are very useful.They are like small computers.You can put a lot of information into them. For example.you can put in telephone numbers and e-mail addresses.Many people use PDAs to remember important dates.Some of these super machines can even send and receive e-mails. PDAs are small and convenient.A few years ago,they were expensive.Now,they are cheap.Many people use them at work and at school.People can carry PDAs in their shirt pockets. But,it’s important to be careful.These little machines are easy to lose.People put so much important information into their PDAs.It’s really terrible to lose them. 50.What is the main idea of the article? A.PDAs are like small computers.        B.PDAs are cheap. C.You can do many things with a PDA.   D.Too many people use PDAs 51.What do we learn about PDAs? A.They are not very expensive now.          B.Students do not like to use them. C.All of them can send and receive e-mails.   D.They are very large. 52.What kind of person would not use a PDA? A.A  business person.    B.Someone who hates computers. C.A  student.            D.A  person with a busy schedule.
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【多选题】cc2530的发送数据桢格式由哪几部分组成?( )。
A.
同步头
B.
帧载荷
C.
帧尾
D.
帧开始界定符
【简答题】一旦发生强心苷中毒,需立即( )强心苷,发生室性心动过速、心室纤颤,首选( )解救;发生 心动过缓、房室阻滞,可用( )解救;危及生命的严重强心苷中毒,可应用地高辛抗体的Fab片段和考来烯胺解救。
【简答题】请将五十音图的あ、か、さ行的平假名和片假名各写十行,每行十遍。
【单选题】通过色灯信号机显示一个()灯光,不准列车越过该信号机。(半自动闭塞区段)。
A.
红色
B.
黄色
C.
绿色
D.
月白色
【单选题】钨极氩弧焊的水冷系统描述不正确的是( )。
A.
水冷系统对焊枪有冷却作用
B.
水冷式焊枪,焊接电缆常装入通水软管
C.
水冷式焊枪,通水软管常装入焊接电缆
D.
水冷系统对钨极有冷却作用
【多选题】带传动的特点是什么?
A.
传动带与带轮是通过摩擦力传递运动和动力的
B.
适宜用在两轴中心距较大的场所
C.
结构简单、制造、安装、维护方便,成本低
D.
具有自锁作用
【简答题】薏苡仁生品 偏寒凉,长于( ),清热排脓,除痹止痛;而炒薏苡仁药 性偏于平和,长于( )。
【单选题】V带传动的特点是 。
A.
缓和冲击,吸收振动
B.
传动比准确
C.
能用于环境较差的场合
D.
结构紧凑
【单选题】带传动的特点是 ( )
A.
传动比不准确.
B.
瞬间传动比准确.
C.
传动比准确.
【简答题】请将五十音图的あ、か、さ行的平假名和片假名各写二十遍。
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