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【简答题】
若直线 与直线 互相垂直，则 的值为 .
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举一反三
【单选题】Jana and Kate are the owners of an upscale jewelry boutique that offers unique and much-desired accessories in an affluent neighborhood. Jana and Kate are concerned, however, that the company's commit...
A.
Other local businesses may be forced to close their doors.
B.
The health of employees and their children is starting to suffer.
C.
Local investors and stakeholders seek to invest their money elsewhere.
D.
The boutique's customer base may decrease sharply due to moderate increases in price.
E.
Employees may begin making fewer charitable personal donations.
【单选题】相距为 1.5 倍波长的相干波源分别处在 a 和 b 处,它们在介质中产生的两列波的波长均为 l ,振幅均为 A 。 c 是 ab 连线上 b 点外侧的任意一点。则 a 、 b 两波源发出的波到达 c 点时的相位差为 , C 点体元的振幅 。
A.
-3π，0
B.
3π，0
C.
-3π，1
D.
3π，1
【单选题】There was never any time for Kate to feel lonely, ________she was an only child.
A.
ever since
B.
now that
C.
even though
D.
even as
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