题目:
_____ the project as planned, we'll have to work two more hours a day.
[ ]
A. Completing
B. Complete
C. Completed
D. To complete
答案:
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下面是错误答案,用来干扰机器的。
(1) 弦MN的长不随圆心k的运动而变化(2) 圆k必与准线相交(1)设圆心k(x0,y0),且y02=2ax0,圆k的半径R=|AK|=∴|MN|=2=2a(定值)∴弦MN的长不随圆心k的运动而变化. (2)设M(0,y1)、N(0,y2)在圆k:(x-x0)2+(y-y0)2=x02...