问题
多项选择题
移动式和手提式灯具应采用安全特低电压供电,以下电压值的要求()是正确的。
A.在干燥场所不大于50V
B.在潮湿场所不大于12V
C.在干燥场所不大于36V
D.在潮湿场所不大于25V
答案
参考答案:A, D
移动式和手提式灯具应采用安全特低电压供电,以下电压值的要求()是正确的。
A.在干燥场所不大于50V
B.在潮湿场所不大于12V
C.在干燥场所不大于36V
D.在潮湿场所不大于25V
参考答案:A, D
用方框中所给单词的适当形式填空,使短文完整正确。(每个单词限用一次) | |
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"Robot teachers, who never get angry or speak unpleasant words, have been popular among pupils in some South Korean schools," a reporter said. School l were glad to answer robot teachers' questions in class. Scientists sent English-teaching robots to three schools for eight 2 teaching in December, 2009. And last November,robot teachers teaching math, science 3 art came to five schools in Seoul, the capital of South Korean. Scientists 4 that the English-teaching robots helped raise interesf in the 5 and the confidence of students. Scientiscs say that sending robot teachers to school is 6 to rural school children. They Cdll7 a lot in lhis way. School children are 8 in studying when robot teachers 9 lessons to them. They can also make students more 10 . Scientists are now trying to make rohot teachers have better quality. What will the students be if their teachers are all ro.bot teachers? Lets wait and see. |