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The corporate head office of TestKing has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence,what will happen?（）

A. UDP will send an ICMP Information Request to the source host.
B. UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
C. UDP will drop the datagrams.
D. UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.
E. UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.

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4B15离心泵的含义？

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验车照片的拍摄要求有：（）

A. 验车照片至少4张
B. 对于局部损失或尾标在整体照片中无法清晰体现的，可以补充拍摄局部照片
C. 拍摄照片应在光线充足的情况下顺光拍照，严禁逆光拍摄
D. 数码照片拍摄完成后，不得对图像做任何编辑修改，可以附加文字说明，并上传影像系统

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