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【多选题】
如图所示表示两列相干水波的叠加情况,图中的实线表示波峰,虚线表示波谷,设两列波的振幅均为5 cm,且在图示的范围内振幅不变,波速和波长分别为1 m/s和0.5 m.C点是BE连线的中点,下列说法正确的是( )A.
C、E两点都保持静止不动
B.
图示时刻A、B两点的竖直高度差为20 cm
C.
图示时刻C点正处在平衡位置且向上运动
D.
从图示的时刻起经0.25 s后，B点通过的路程为20 cm
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【简答题】EPO是()的缩写,它的主要作用是()。
【单选题】We used to see each other ______,but I haven’t heard from him since last year.
A.
especially
B.
particularly
C.
regularly
D.
approximately
【单选题】We used to see each other _____, but haven’t heard from him since last year.
A.
especially
B.
regularly
C.
particularly
D.
approximately
【单选题】— Long time no see! — Yes, we haven’t seen each other _____ May 4, 2009.
A.
since
B.
in
C.
on
【单选题】We used to see each other ▲ but I haven’t heard from him since last year.
A.
especially
B.
regularly
C.
particularly
D.
finally
【单选题】We used to see each other , but I haven’t head from him since last year.
A.
especially
B.
regularly
C.
particularly
D.
approximately
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