型号为N300-16.7/538/538的汽轮机是：

氰化高铁血红蛋白吸收峰（nm）是在（） A: 535 B: 538 C: 540 D: 550 E: 560

There are _____ voting members in the House of Representatives. A: 100 B: 270 C: 435 D: 538

At least how many votes should be received so that the candidate for the U.S. President can obtain an absolute majority of electoral votes and then is elected to that office? A: 100 out of 435 votes B: 270 out of 538 votes C: 270 out of 435 votes D: 100 out of 538 votes

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

Q2 How much votes does a candidate need to win the presidency? A: 288 B: 270 C: 280 D: 538

To be successful, a candidate for the U.S. Presidency must receive at least ______ electoral votes. A: 260 B: 180 C: 270 D: 538

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

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

background:url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层() A: 2、png B: 1、jpg C: 3、png D: 4、jpg