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问题 单项选择题

根据《中华人民共和国票据法》的规定，以背书转让的汇票，（）应当对其（）背书的真实性负责。

A、后手，所有前手

B、所有前手，后手

C、后手，直接前手

D、直接前手，后手

答案

参考答案：C

多选题
如图为理想变压器原线圈所接交流电压的波形．原、副线圈匝数比n1：n2=10：1，串联在原线圈电路中电流表的示数为1A，下列说法正确的是（　　）

A．变压器输出端所接电压表的示数为20V

B．变压器的输出功率为200W

C．变压器输出端的交流电的频率为50Hz

D．穿过变压器铁芯的磁通量变化率的最大值为20/n2Wb/s
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单项选择题

DOM is a platform and language - (66) API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incorporated back into the presented (67) DOM is a (68) -based API to documents, which requires the whole document to be represented in (69) while processing it. A simpler alternative to DOM is the event - based SAX, which can be used to process very large (70) documents that do not fit into the memory available for processing.

A．XML

B．HTML

C．script

D．Web
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