若一无线电接收机接收到频率为<img src="data:image/png;base64,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" data-latex="{10}^{8}" />Hz 的电磁波的功率为1微瓦，则每秒接收到的光子数为________<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEIAAAArCAYAAADMr156AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAACySURBVGhD7dbRDYIwFIXhhg2MGziBAzgBEzCZMzgCKxhXcAfjBHBv6Ul4qPgmpvf/khNa6EtPSCEBAAAAAAAghovlZjnm2Wf+/Grp86xBvsGH5VnGNVrjOfmNVm2VEaYEqZURrgRZl+EbD1mCqIypXHcroSvXf3CwvJfh7+1ZhL8N4zJMZ8vLcrfozAihdjCuz4wQZdRKkDBlbJUgIcrQL/a3r4MX4OuGPAMAAAAAoAEpzcx8I76qk+i2AAAAAElFTkSuQmCC" data-latex=" imes "/><img src="data:image/png;base64,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" data-latex="{10}^{19}" />个 A: 1.5 B: 2 C: 1 D: 1.75

以下哪些不属于图片文件格式（） A: jpg B: png C: gif D: img

写出下面PHP代码运行的输出结果____。$arr1 = array("img12.png", "img10.png", "img2.png", "img1.png");usort($arr1, "strnatcmp");echo $arr1&#91;2&#93;;

<;img>;所支持的图片格式不包括( )。 A: PNG B: JPEG C: MP3 D: GIF

PNG图片可以以几位储存图像数据？（） A: 8 B: 16 C: 10 D: 24

HA的Ka为1.8×10[img=17x22]18036bc58d94522.png[/img]，则Ac[img=11x21]18036bc5961db98.png[/img]的Kb为( ) A: 1.8×10[img=17x22]18036bc59f11a63.png[/img] B: 1.8×10[img=7x22]18036bc5a7c3e95.png[/img] C: 5.6×10[img=23x22]18036bc5b012b4f.png[/img] D: 5.6×10[img=7x22]18036bc5b8e29e5.png[/img]

以下哪些图像格式支持透明背景（） A: PNG/JPEG B: PNG/GIF C: JPEG/GIF D: BMP/PNG

已知K[img=11x27]1803dd464e13b94.png[/img]=1.8×10[img=17x22]1803dd4656d39db.png[/img]，则其共轭酸的K[img=11x26]1803dd465f45cdd.png[/img]值为( )。 A: 1.8×10[img=17x22]1803dd46675c1d8.png[/img] B: 1.8×10[img=23x22]1803dd466ff800d.png[/img] C: 5.6×10[img=23x22]1803dd4678d8769.png[/img] D: 5.6×10[img=17x22]1803dd46828c2c1.png[/img]

【单选题】下列哪组图像格式都是网页支持的图像格式? A. GIF、PSD、PNG B. JPEG、GIF、PNG C. PNG、GIF、PSD D. PSD、JPEG、PNG

HA的Ka为1.8×10[img=17x22]1803d1ad57b5469.png[/img]，则Ac[img=11x21]1803d1ad5fcf787.png[/img]的Kb为( ) 未知类型：{'options': ['1.8×10[img=17x22]1803d1ad677146f.png[/img]', '1.8×10[img=7x22]1803d1ad7065041.png[/img]', '5.6×10[img=23x22]1803d1ad797e303.png[/img]', '5.6×10[img=7x22]1803d1ad8272885.png[/img]'], 'type': 102}