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【简答题】
图中所示以O 为圆心的各圆弧为静电场的等势线图, 已知 ,则a 、b 两点电场强度的大小: (填大于 、等于或小于);
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【单选题】— Look! There ________! — Oh;yes,there __________ ! [ ]
A.
comes Tom;comes he
B.
Tom comes;he comes
C.
Tom comes;comes he
D.
comes Tom; he comes
【单选题】Tom likes fish very much. He often buys some fish in the shop and takes it home. But when his wife sees the fish, she says to herself, “Good! I can ask my friends to have lunch, and we can eat the fis...
A.
Tom
B.
Tom’s wife
C.
The cat
D.
Tom’s wife and her friends
【单选题】广义笛卡尔积属于关系运算符中的(40)。两个元数分别为n目和m目的广义笛卡尔积是一个(41)列的元组集合，其形式定义如下：(42)＝(43)。
A.
集合运算符
B.
专门运算符
C.
比较运算符
D.
逻辑运算符
【简答题】阅读理解,根据短文内容,判断下列句子正(T)误(F)。 Every Saturday Tom goes to the park and plays s with his friends. And he comes home at twelve thirty for his luch. But today a car stops at his house at twelve o'clock....
【简答题】阅读理解 Tom is a seaman. He is always drunk（喝醉）. One day Tom goes to a new city. He drinks very much in a bar that night. When he goes out of the bar，he sees a man lying in the street. The man is quite d...
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