皮皮学，免费搜题
登录
搜题
【单选题】
抛物线y=ax 2 +x+c的顶点在第三象限，且ac＜0，则关于此抛物线的说法正确的是（ ）A.
抛物线的开口向上，与y轴交于正半轴
B.
抛物线的开口向上，与y轴交于负半轴
C.
抛物线的开口向下，与y轴交于正半轴
D.
抛物线的开口向下，与y轴交于负半轴
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】若 是幂函数，则该函数的值域是__________
【单选题】Lily: I’m afraid we just don’t see eye to eye on this. Let’s call a meeting with the team and see what they think. John: Okay, let’s do that. It’s clear that Lily John.
A.
. agrees with
B.
disagrees with
C.
fights with
D.
argues with
【单选题】I’ve been waiting for my order for seven weeks. I’m afraid this is just not good enough.
A.
We are sorry but we do still need to make sure that the majority of fare paying passengers are not supporting the minority.
B.
Yes, I ’ m sorry. We should have phoned you.
C.
Yes, you ’ re right. I ’ m sorry for the inconvenience , but I can assure you we ’ ll do everything we can to send it out to you today
D.
We are sorry that your own personal experience has been so difficult over the past few weeks.
【单选题】某同学的午餐如下:二两米饭、一份红烧肉、一份蔬菜、一个煮鸡蛋。叙述正确的是
A.
．该午餐包含脂肪、磷脂和固醇等脂质
B.
．该午餐含有的多糖只有糖原和淀粉
C.
．生鸡蛋比熟鸡蛋的蛋白质更易消化
D.
．午餐中的DNA可改变人体的DNA
相关题目：