How can quantum dots be used to confirm diseases?
A. By traditionally looking at a person’s blood under a microscope.
By letting a person take some kind of medicine.
C. By lighting up in the presence of a targeted molecule.
D. By subjecting a person to an X—ray examination.
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在填写票据的出票日期时,下列各项中,将“10月20日”填写正确的是()。
纳税人通过邮政部门办理交寄手续,并向邮政部门索取收据作为申报凭据的,其纳税申报的日期为()。