皮皮学，免费搜题
登录
搜题
【简答题】
已知△OFQ的面积为2 6 ，且 OF ? FQ =m， （1）设 6 ＜m＜4 6 ，求向量 OF 与 FQ 的夹角θ的取值范围； （2）设以O为中心，F为焦点的双曲线经过点Q（如图），| OF |=c，m=（ 6 4 -1）c 2 ，当| OQ |取最小值时，求此双曲线的方程．
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
【单选题】Whil watching television, .
A.
The doorbell rang
B.
the doorbell rings
C.
we heard the doorbell ring
D.
we heard the doorbell rings
【判断题】红船精神包括:敢为人先的首创精神,坚定理想、百折不挠的奋斗精神,立党为公、忠诚为民的奉献精神。其中,“立党为公、忠诚为民的奉献精神”是红船精神的本质。
A.
正确
B.
错误
【判断题】Whil taking notes, we can use the upright arrow ( ↑ ) to indicate "increase". ( )
A.
正确
B.
错误
【单选题】There are few things worse for a new parent than listening to a baby scream in hunger while a bottle of formula slowly warms up in a bowl of hot water. So why not just pop the bottle in the microwave ...
A.
Babies generally refuse to eat formula that has been heated in a microwave.
B.
Microwave radiation might break down some of the proteins in formula that are vital to a baby's health.
C.
Different microwaves use different amounts of power, and consequently some models could heat a bottle to scalding temperature faster than others.
D.
Parents cannot be expected to consistently even out the temperature of a microwaved bottle by shaking it vigorously before giving it to the baby.
E.
Once formula has been heated, any leftover formula should be discarded, because otherwise the formula could spoil between feedings and make the baby sick.
相关题目：