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【单选题】
The fire risk presented by a flammable cargo depends upon ________ above it.A.
the oxygen content of the atmosphere
B.
the lower explosive limit
C.
the heavy corrosivity
D.
the expansion coefficient
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【单选题】平移坐标系到canvas的中心位置,用下列哪个Canvas方法来实现?绘图环境对象为context。
A.
context.translate(canvas.width/2,canvas.height/2);
B.
context.transform(canvas.width/2,canvas.height/2);
C.
context.transfer(canvas.width/2,canvas.height/2);
D.
context.translation(canvas.width/2,canvas.height/2);
【单选题】Which canvas built-in display the given canvas in front of any stacked canvases?（）
A.
HIDE_VIEW
B.
SHOW_VIEW
C.
SET_CANVAS_PROPERTY
D.
REPLACE_CONTENT_VIEW
【单选题】canvas中二维绘图环境对象获取的语句是哪项?假设canvas为获取的canvas对象名。
A.
var ctx=canvas.getContext("2d");
B.
var canvas=document.getElementById("myCanvas");
C.
var ctx=canvas.getContext("WebGL");
D.
var ctx=canvas.getElementById("2d");
【简答题】根据表格内容，完成下列短文。 Tom yesterday go to the park play basketball now watch sports on TV eat ice cream tomorrow swim in the lake flya kite I am Tom. Yesterday I ________(1)_______. And I ______(2)________...
【单选题】清除当前canvas(绘图环境context)的左半部分的内容,然后绘制于离屏canvas,下方需补全的代码是? // 此处为清除canvas的左半部分的内容 ----- 补全代码处 ----- offcanvas.getContext('2d').drawImage(canvas, 0,0);
A.
canvas.clearRect(0, 0, offcanvas.width/2, offcanvas.height);
B.
context . clearRect(canvas.width/2, canvas.height, 0, 0);
C.
context.clearRect(0, 0, offcanvas.width/2, offcanvas.height);
D.
canvas .getContext('2d') .clearRect(0, 0, canvas.width/2, canvas.height);
【简答题】对BallView类中的onDraw方法,使用绘图的Canvas类中常用的绘图方法(函数),如下: canvas.drawArc () ----扇形 canvas.drawCircle() ----圆 canvas.drawOval() ----椭圆 canvas.drawLine() ----线 canvas.drawPoint() ----点 ca...
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