png的最优值是（） A: -2 B: -6 C: -45/4 D: -7

4.若有压圆管内水流为层流运动，则必有( )。 A: 9v/πdμ＜575 B: 9v/πdμ＜2300 C: 9v/πdv＜575 D: 9v/πdv＜2300

1A=uA/ananas/latex/p/575

若[img=100x50]180364408d6b575.png[/img]，[img=163x50]18036440973d7cb.png[/img]都收敛，则[img=100x50]180364409fcafa1.png[/img]也收敛

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

支持透明的图片格式是（） A: GIF 和 JPG B: GIF 和 PNG C: PNG 和 JPG D: GIF 、 JPG 和 PNG

常见的图像格式有（ ） A: MP4 GIF PNG PSD TIF B: JPG/JPEG GIF PNG PSD TIF C: JPG/JPEG RGB PNG PSD TIF D: CMYK GIF PNG PSD TIF

Alana is not registered for sales tax purpose. She has recently received an invoice for goods for resale which cost $500 before sales tax, which is levied at 15%. The total value was therefore $575. What is the correct entry to be made in Alana's general ledger in respect of the invoice? A: Dr Purchases $500, Dr Sales tax $75, Cr Payables $575 B: Dr Purchases $575, Cr Sales tax $75, Cr Payables $500 C: Dr Purchases $500, Cr Payables $500 D: Dr Purchases $575, Cr Payables $575

‏十六进制数16F转换成八进制数是（）。​ A: 557 B: 357 C: 375 D: 575

十六进制数16F转换成八进制数是（）。 A: 557 B: 357 C: 375 D: 575