【单选题】在CSS样式中以下哪个选项( )不属于基本选择器的分类。
【单选题】画布是canvas,如何获取该画布的画笔?
A.
var ctx=canvas.getContext('4d');
B.
var ctx=canvas.getContext('1d');
C.
var ctx=canvas.getContext('3d');
D.
var ctx=canvas.getContext('2d');
【单选题】He _____ home once a week, but after entering middle school, he _____ home once a month. [ ]
A.
was used to go, was used to go
B.
used to go, was used to go
C.
was used to go, used to
D.
used to go, was used to going
【多选题】关于英国现代主义小说的特点,下列哪些选项是正确的?
【单选题】在CSS样式中以下哪个选项(___)不属于选择符的分类。
【单选题】原子吸收光谱法中的基体效应干扰可用下述哪种方法消除?( )
【单选题】获取 离屏 Canvas 上的图像数据,并绘制到可见的 Canvas 上,假设离屏 Canvas 已经创建且对象名为 offscreenCanvas ,下面正确的调用语句是哪项?
A.
context.drawImage(Canvas, 0, 0);
B.
context.drawImage(offscreenCanvas, 0, 0);
C.
offscreenCanvas.drawImage(canvas, 0, 0);
D.
canvas.drawImage(offscreenCanvas ,0, 0);