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21)“Why were you late?”“I had a hard time ____ up this morning.” A) to get B) get C) got D) getting 22)I remember ____ to help us if we ever got into trouble. A) once offering B) him once offering C) him to offer D) to offer him 23)John regretted ____ to the meeting last week. A) not going B) not to go C) not having been going D) not to be going 24) It is difficult to get used ____ in a tent after having a soft, comfortable bed to lie on. A) sleep B) to sleeping C) slept D) to sleep 25) He gives people the impression ____ many poems. A) of having written B) to have written C) of being written D) to write 26) Do you feel like ____ out or would you rather ____ dinner at home? A) going...to have B) to go...to have C) to go...having D) going...have 27) Prior to ____ the formal speech, first he will introduce himself. A) delivering B) deliver C) being delivering D) being delivered 28)I don't mind ____ by bus, but I hate ____ in queues. A) to travel...standing B)having traveled...standing C) traveling...to stand D) traveling...standing 29)What about ____ double quantities of everything today? We have hardly time to go____ next week. A) buying...to shop B) buy...shopping C) buying...shopping D) to buy...shopping 30) We had some trouble ____ the house and nobody seemed ____ where it was. A) in finding...knowing B) finding...to know C) to find...knowing D) to find...to know 31)We can't imagine ____ in the entrance examination, for she has never been to school. A) she succeeding B) her succeeding C) she succeed D) her to succeed 32)I don't like ____ at me. A) them laughing B) their laugh C) them laugh D) them to have laughed 33)We suggested ____ in hotels but the children were anxious ____ out. A) sleeping...to camp B) sleeping...camping C) to sleep...to camp D) to sleep...camping 34)I have no objection ____ the evening with them. A) to spend B) to spending C) of spending D) spending 35) After ____ for the job, you will be required to take a language test. A) being interviewed B) interviewed C) interviewing D)having interviewed 36)The match was canceled because most of the members ____ a match without a standard court. A) objected to shavings B) were objected to have C) objected to have D) were objected to having 37)Jean did not have time to go to the concert last night because she was busy ____ for her examination. A) to prepare B) to be prepared C) preparing D) being prepared 38)It is no good ____ remember grammatical rules. You need to practise what you have learned. A) trying to B) to try to C) try to D) tried to 39)After ____ him better, I regretted ____ him unfairly. A) getting to know...to judge B) getting to know...to have judged C) getting to have know...judging D) getting to know...having judged 40)He is looking forward to ____ his holiday in Britain. A) spend B) have spent C) spending D)having been spending
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举一反三
【简答题】简述尺寸标注的基本规则。
【判断题】优先编码器允许同时输入两个以上的有效编码信号,当同时输入几个有效编码信号时,优先编码器能按预先设定的优先级别,只对其中优先级别最高的一个进行编码。
A.
正确
B.
错误
【简答题】一般b编码器若同时输入两个以上信号,编码器输出就会______。优先编码器同时输入两个以上信号时,只按_____的输入信号编码,_____的输入信号不起作业。
【单选题】编码器同时输出 A 、 B 两相脉冲,下图所示信号描述正确的是
A.
A 、 B 相信号同相
B.
A 相超前 B 相 90 度
C.
A 相滞后 B 相 90 度
D.
无法判别
【单选题】编码器同时输出 A 、 B 两相脉冲,主要目的是
A.
安全冗余
B.
分辨转速方向
C.
获得脉冲的个数
D.
获得脉冲的频率
【简答题】一般编码器若同时输入两个以上信号,编码器输出就会( )。优先编码器同时输入两个以上的信号时,只按( )的输入信号编码,( )的输入信号不起作用
【简答题】协调既是 又是 ,同时还是 。
【单选题】优先编码器同时有两个输入信号时,是按 的输入信号编码。
A.
高电平
B.
低电平
C.
高优先级
D.
高频率
【判断题】阴虚质心理特征:性情急躁,外向好动,活泼。
A.
正确
B.
错误
【单选题】编码器同时输出 A 、 B 两相脉冲,下图所示信号描述正确的是
A.
A 、 B 相信号同相
B.
A 相超前 B 相 90 度
C.
A 相滞后 B 相 90 度
D.
无法判别
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