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【判断题】
是平面上按段光滑的封闭曲线,当原点O在L所围区域外部时, 积分 ( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】6x7=
【单选题】He didn't come yesterday. He ______ busy working in the lab.
A.
must be
B.
would have been
C.
must have been
D.
would be
【判断题】The 6x7 rule indicates that no more than 6 words per line and no more than 7 lines per slide.
A.
正确
B.
错误
【单选题】Pyramids are large structures with square bases and four smooth, triangular-shaped sides that come to a point at the top. Several ancient peoples used pyramids as tombs or temples. The most famous pyr...
A.
The Mayas.
B.
The Mochica Indians of Peru.
C.
The Indians of Central Mexico.
D.
The Indians of South America.
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