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【单选题】
设函数f(x)在[a,b]上连续,则A.
小于零
B.
等于零
C.
大于零
D.
不确定
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举一反三
【单选题】My______ brother is three years ______than I.
A.
older, elder
B.
elder, elder
C.
elder, older
【单选题】Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively areas such as attention and memory. This is true regard...
A.
whose minds are alert and receptive
B.
who are highly intelligent
C.
who can remember large amounts of information
D.
who are good at recognizing different sounds
【单选题】My brother is three years than I .
A.
elder, elder
B.
older, older
C.
older, elder
D.
elder, older
【单选题】Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive areas such as attention and memory. This i...
A.
who can remember large amounts of information
B.
who are highly intelligent
C.
whose minds are alert and receptive
D.
who are good at recognizing different sounds
【多选题】关于变压器额定容量与绕组额定容量的区别，描述正确的包括( )。
A.
双绕组变压器的额定容量即为绕组的额定容量
B.
多绕组变压器应对每个绕组的额定容量加以规定，其额定容量为最大的绕组额定容量
C.
当变压器容量由冷却方式而变更时，则额定容量是指最大的容量
D.
当变压器容量由冷却方式而变更时，则额定容量是指最小的容量
【简答题】阅读短文，根据短文内容选择正确答案。 My name is Peter．I am 12．I have one brother and one sister．My brother is 15 and my sister is 9．I have a friend．He is an English boy．His name is Tanaka．He is in my class．I have a dog...
【简答题】对于JK触发器,若使得Q的状态从0态到1态,则应加的信号是J=____、K=____。
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