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【判断题】
食品中农药残留污染主要有直接污染、间接污染和意外事故性污染。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】设级数 收敛，则下列选项中不一定成立的是( )． (A) 收敛 (B) (c≠0)收敛 (C) 收敛 (D)
【简答题】设正项级数 收敛，则下列无穷级数中一定发散的是（ ）
【单选题】Why was the writer so nervous?
A.
He had never stood before a video camera.
B.
He had never read his own article before a video camera.
C.
This camera was different from the one he had once faced.
【单选题】By mentioning that Socrates himself never wrote anything, the writer implies that______.
A.
it was surprising that Socrates was so famous but had published no work.
B.
Socrates was not so learned as he is reputed to have been
C.
Socrates used the work of his students in teaching
D.
the authorities refused to publish Socrates' works
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