考前题库第997页

网络题库

I decided o ___________ as a waie i a esaua duig my summe vacaio.
I decided to ___________ as a waiter in a resaurant during my summer vacation.serve|turn|take|make正确答案:serve...
Is his he school ______ you woked duig he summe vacaio
Is this the school ______ you worked during the summer vacationthat|which|in which|when正确答案:in which...
Is his he school ______ you woked duig he summe vacaio
Is this the school ______ you worked during the summer vacation正确答案:in which...
Look！They (play)________ he baskeball o he playgoud.
Look！They (play)________ the basketball on the playground.正确答案:are playing...
Tom was sog i swimmig. He is good a baskeball, oo.Tom is sog i swimmig, good a baskeball.
Tom was strong in swimming. He is good at basketball, too.Tom is strong in swimming, good at...
3、Tom waed o play fooball wih his fieds i he see, bu his fahe old him_.
3、Tom wanted to play football with his friends in the street, but his father told him_. 正确答案:not to...
She o wok whe he elephoe ag.
She to work when the telephone rang.正确答案:was about to go...
_____goioheoom_____heelephoeag.
_____gotintotheroom_____thetelephonerang.Hehardlyhad;then|Hardlyhadhe;when|Hehadnot;then|Nothadhe;when正确答案:Hardlyhadhe;w...
He ________ io he office buildig whe he fie bell ag.
He ________ into the office building when the fire bell rang.goes|has gone|was going|is going正确答案:was going...
时序逻辑电路包括组合逻辑电路和存储电路
时序逻辑电路包括组合逻辑电路和存储电路正确答案:对...
中国大学MOOC: 分析下图所示逻辑电路。假定电路初始状态为“000”，下列描述正确的有（）。【图片】
中国大学MOOC: 分析下图所示逻辑电路。假定电路初始状态为“000”，下列描述正确的有（）。【图片】正确答案:这是一个Moore型的同步时序逻辑电路。\n电路存在无效状态，具有自启动功能。...
下图所示为某组合逻辑电路的输入A、B和输出Y的波形，该逻辑电路的逻辑式应为()。ebe3a10c056aef4f8e7977d79e0fc99f.pg
下图所示为某组合逻辑电路的输入A、B和输出Y的波形，该逻辑电路的逻辑式应为()。ebe3a10c056aef4f8e7977d79e0fc99f.png正确答案:C...
三相对称负载接在三相电源上，若各相负载的额定电压等于电源线电压，负载应作连接。
三相对称负载接在三相电源上，若各相负载的额定电压等于电源线电压，负载应作连接。星形|三角形|开口三角形|双星形正确答案:三角形...
对称三相负载星形连接，电源线电压为380V，负载为纯电阻R=10Ω，每相负载的相电流为 A，线电流 A。
对称三相负载星形连接，电源线电压为380V，负载为纯电阻R=10Ω，每相负载的相电流为 A，线电流 A。正确答案:22|22...
不对称三相负载，每相绕组额定电压220V，对称三相电源线电压380V，三相绕组应采用（）。
不对称三相负载，每相绕组额定电压220V，对称三相电源线电压380V，三相绕组应采用（）。星形联结带中线|三角形联结|星形联结不带中线|不确定正确答案:星形联结带中线...
三相异步电动机铭牌上的额定功率是指三相异步电动机额定运行时，______。A．输入的三相电功率
三相异步电动机铭牌上的额定功率是指三相异步电动机额定运行时，______。A．输入的三相电功率定、转子铁损|电磁功率|轴上输出的机械功率正确答案:轴上输出的机械功率...
异步电动机按( )可分为单相异步电动机和三相异步电动机。
异步电动机按( )可分为单相异步电动机和三相异步电动机。 A.结构 B.定子绕组的组数 C.容量 D.转子的组数正确答案:正确答案：B...
三相异步电动机，YB为异步电动机。
三相异步电动机，YB为异步电动机。正确答案:第一空：防爆型...
$一台三相异步电动机，其铭牌上标明额定电压为220\/380V，其接法应是。$

一台三相异步电动机，其铭牌上标明额定电压为220\/380V，其接法应是。
一台三相异步电动机，其铭牌上标明额定电压为220\/380V，其接法应是。Y\/△|△\/Y|△\/△|Y\/Y正确答案:△\/Y...
三相异步电动机的额定功率＝8kW，UN＝380 V，cosΦN＝0.85，η＝0.8，可推算额定电流IN______。
三相异步电动机的额定功率＝8kW，UN＝380 V，cosΦN＝0.85，η＝0.8，可推算额定电流IN______。17.9A|26A|10.3A|31a正确答案:17.9A...