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【判断题】
Case Is>10 And Is<20 是不合法的A.
正确
B.
错误
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举一反三
【简答题】如图，梯形ABCD中，AB ∥ CD，AD=BC，O为梯形ABCD外一点，OA、OB分别交DC于点F、E，且OA=OB （1）写出图中你认为全等的几对三角形（不再添加辅助线）； （2）选择你在（1）中写出的全等三角形中的任意一对进行证明．
【单选题】Which of the following principles is usually recommended for inclusion in legislation on data protection?
A.
The data user should provide the data subject with regular and detailed information on the data held
B.
All personal data held by data users should be updated by checking this data with the subject at regular intervals
C.
All personal data held by data users should be adequate for the purposes of the data user but not excessive
D.
All personal data held by data users should be reviewed regularly and automatically deleted after a specified period of time
【单选题】如图,在梯形ABCD中,AB∥CD,O为AC与BD的交点,CO=2AO,则梯形ABCD与三角形AOB的面积之比为:
A.
6：1
B.
7：1
C.
8：1
D.
9：1
【简答题】如图，在梯形ABCD中，AB ∥ CD，AD=BC，对角线AC⊥BD，垂足为O．若CD=3，AB=5，则AC的长为______．
【单选题】The ability of two polynucleotide strands to hybridize is based on which of the following principles?
A.
double helical nature of DNA
B.
the presence of phosphodiester bonds
C.
complementary base pairing
D.
the presence of 3' and 5' ends
E.
the presence of covalent bonds
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