将下列二次圆锥曲线方程化为标准形，并指出它们的形状：[tex=17.0x1.5]OrndGMXcE2x69J9o+ciHwxzAZZD0/0/7lL+/Y+YC3qkSHpFrpdeMXrCdS+v2yY+K[/tex]

Please leave ______ 7:00, then you'll be able to get there ______ time. A: till, in B: until, on C: before, on

从3、5、7、ll四个数中任取两个数相乘，可以得到多少个不相等的积 A: 5 B: 4 C: 6 D: 7

W: I’ll get to Cairo at 7:00 p.m. New York time. What time is it in CairoM: Let me see, it is 7 hours later in Cairo. What time is it in Cairo(). A: 2:00a.m. B: 12:00 noon. C: 7:00 p.m.

正常成年人血量占体重的 A: 3％～4％ B: 5％～6％ C: 7％～8％ D: 10％～ll％ E: 15％～20％

At 7:30 , I’ll drive over to （ ）you（ ）.Please get ready at that time . A: pick … on B: pick …out C: pick …up D: pick …off

I’ll come at ten, ____________ I’ll be free.

What will these people be doing in a few months（） A: They’ll finish their examination. B: They’ll have their Christmas vacation. C: They’ll visit their friends at college. D: They’ll study at a college.

在jQuery中下面哪些创建节点的方式是正确的？ A: var $ll=$("") B: var $ll=$("河南科技大学") C: var $ll=$("苹果") D: var $ll=$("") E: var $ll=$("苹果")

下列哪项关于受拉钢筋绑扎搭接长度ll与锚固长度la的关系是正确的（）。 A: ll=la B: ll＞la C: ll＜la D: ll≥la