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【单选题】
人耳最敏感的振动频率范围是
A.
16~100 Hz
B.
100~300 Hz
C.
1000~3000 Hz
D.
3000~9000 Hz
E.
9000~12000 Hz
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皮皮学刷刷变学霸
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【简答题】若 e 1 , e 2 是两个不共线的向量,已知 AB =2 e 1 +k e 2 , CB = e 1 +3 e 2 , CD =2 e 1 - e 2 ,若A,B,D三点共线,则k=______.
【简答题】(AmE) a student in the second year of a US college or high school 2. the fact of being either male or female 3.to force a leader or government out of their position of power 4. to remove a government ...
【简答题】(本小题满分12分)已知 e 1 , e 2 是两个不共线的向量, = e 1 + e 2 , =- λe 1 -8 e 2 , =3 e 1 -3 e 2 ,若 A 、 B 、 D 三点在同一条直线上,求实数 λ 的值.
【单选题】设e 1 ,e 2 是两个不共线的向量,已知 AB =2e 1 +ke 2 , CB =e 1 +3e 2 , CD =2e 1 -e 2 ,若A、B、D三点共线,则k的值是(  )
A.
8
B.
-8
C.
-7
D.
7
【单选题】已知 e 1 , e 2 是两个不共线的向量 , a = 2 e 1 - e 2 , b = k e 1 + e 2 . 若 a 与 b 是共线向量,则实数 k 的值等于
A.
-2
B.
2
C.
【单选题】Negative capability refers to the capability of being in uncertainties, mysteries, doubts, without any irritable reaching after fact and reason.
A.
Ture
B.
False
【简答题】已知e 1 ,e 2 是两个不共线的向量, AB =e 1 +e 2 , CB =-λe 1 -8e 2 , CD =3e 1 -3e 2 ,若A、B、D三点在同一条直线上,求实数λ的值.
【多选题】关于指示剂的变色点,说法正确的是
A.
滴定终点指的是指示剂变点
B.
在络合滴定中,滴定终点的 pM (或 pM ′ )可能大于或小于计量点的 pM (或 pM ′ )
C.
指示剂变色点时 lgK ′ MIn =pM ′
D.
滴定突跃越大,指示剂变色越明显
【单选题】the fact of being in a particular place
A.
punctuation
B.
forward
C.
presence
D.
prepare
【单选题】the fact of being in a particular place
A.
recipient
B.
presence
C.
indicate
D.
compress
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