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【简答题】
短文填空 I remember the occasion when mother sent me to the main road, about twenty yards away from our house, to invite a passing group of seasonal work-seekers for a meal. She 1 (instruct) me to take a basket along and collect dry cow dung( 牛粪 ) for making a fire. I was then to prepare the meal for the group of work-seekers. 2 thought of making an open fire outside at midday, and 3 (cook)in a large three-legged pot in that intense heat, was sufficient to upset even an angel. I did not manage to hide my feelings from my mother and, after serving the group, she called me to the veranda( 走廊 ) 4 she usually sat to attend to her sewing and knitting. 5 straight into my eyes, she asked “Why did you get angry 6 I request you to prepare a meal for those poor people?” 7 my attempt to deny her blame, using the heat of the fire and the sun as excuse for my rude behavior, mother, she gave me a firm look, 8 (say), “You cannot detect what trouble may lie ahead of you.” I 9 (sudden) realized that if I had refused to offer this group of people a meal, 10 would be impossible that in my travels some time in the future, I would get these individuals’ help.
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【单选题】对共析钢和过共析钢进行球化退火后会得到 。
A.
球状珠光体
B.
片状珠光体
C.
网状渗碳体
D.
片状渗碳体
【单选题】三相异步电动机的起动电流与起动时的()
A.
电压平方成正比
B.
电压成反比
C.
电压成正比
【单选题】IGBT综合了( )的优点。
A.
MOSFET和GTO
B.
MOSFET和GTR
C.
GTR和GTO
D.
SCR和GTO
【简答题】下面是一篇存在毛病的工作通知,试写出修改稿。 机关游泳池办证的通知 机关各直属单位: 机关游泳池定于 6月1日正式开放,6月10日开始办理游泳证。请你们接此通知后,按下列规定,于元月三十日前到机关俱乐部办理游泳手续。 一、办证对象:仅限你单位干部或职工身体健康者。 二、办证方法:由你单位统一登记名单、加盖印章到俱乐部办理,交一张免冠照片。 三、每个游泳证收费伍元。 四、凭证入池游泳,主动示证,遵守...
【判断题】IGBT综合了GTR和MOSFET的优点,因而具有低导通压降和高输入阻抗的综合优点。
A.
正确
B.
错误
【多选题】关于IGBT下列说法正确的是()
A.
IGBT是不可控元器件。
B.
因为IGBT的特殊结构,IGBT具有很强的电流控制能力。
C.
开关状态的IGBT工作在有源区。
D.
IGBT是全控型电力电子器件
【单选题】对共析钢和过共析钢进行球化退火后会得到 。
A.
片状珠光体
B.
球状珠光体
C.
网状渗碳体
D.
片状渗碳体
【单选题】下列细菌对盐抵抗力最强的是
A.
副溶血性弧菌
B.
痢疾杆菌
C.
大肠杆菌
D.
伤寒杆菌
E.
沙门氏菌
【判断题】IGBT综合了GTR和MOSFET的优点,具有低导通压降和高输入阻抗的综合优点
A.
正确
B.
错误
【简答题】IGBT综合了_______和__________的优点。
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