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【单选题】
超高频 RFID 卡的作用距离
A.
mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">小于 minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA" xml:lang="EN-US">10cm
B.
宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA" xml:lang="EN-US">1-20cm
C.
宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA" xml:lang="EN-US">C3-8m
D.
mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">大于 minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast; mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA" xml:lang="EN-US">10m
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】已知，Rt△ABC中，∠C=90°，AD平分∠BAC交BC于D，若BC=32，且BD：CD=9：7，则D到AB的距离为（ ）
A.
18
B.
16
C.
14
D.
12