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【多选题】
关于 K线,下列说法正确的有( )。A.
表明收盘价低于开盘价
B.
当最高价等于收盘价，没有上影线
C.
表明收盘价高于开盘价
D.
当最高价等于最低价时，画不出K线
E.
当最低价等于开盘价，没有上影线
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反馈参考答案：
举一反三
【简答题】The first lesson was very______(enjoy) — I liked it a lot!
【单选题】U2-The first lesson I learned in the company was never to the degree of difficulty I would face in career advancement.
A.
undertake
B.
underway
C.
underestimate
D.
understand
【单选题】The first lesson I learned as a soldier was never to the enemy.
A.
underpaid
B.
underestimate
C.
understatement
D.
underdeveloped
【简答题】The first lesson was very____(enjoy).
【单选题】When the son finished the first lesson, his father was _____.
A.
hopeful
B.
sad
C.
doubtful
D.
disappointed
【简答题】The first lesson was very___(enjoy)---I like it a lot!
【简答题】如图所示，一个滑轮组由一个定滑轮和n个动滑轮组成。设所有的滑小相同，下垂的绳子彼此平行，定滑轮的绳子下吊着一重为W 1 的物体，最右边的一个动滑轮下吊着一重为W 2 的物体，如果滑轮和绳子的质量以及滑轮轴承处的摩擦力均可略去不计，绳子长度不变。 求各段绳子中的张力。
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