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【判断题】
数项级数收敛的必要条件是通项极限等于零。 ( )。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】I'm not sure about the meaning of the word. You'd better _____ in a dictionary .
A.
look up it
B.
look it up
C.
look it for
D.
look for it
【单选题】I'm not sure about the meaning of the word. You'd better look it up in a . [ ]
A.
letter
B.
dictionary
C.
postcard
D.
notice
【单选题】I'm not sure of the exact number, but the ________ cost of this type of computer ranges from around $800 to $1000.
A.
present
B.
bare
C.
direct
D.
approximate
【简答题】I'm not sure of the exact number, but the __________ cost of this type of computer ranges from around $800 to $1000.(approximately)
【简答题】请按顺序按提示填写非重读的单词。 I'm not sure of the number.(3个非重读单词)
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