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【简答题】
如何选择萃取剂？
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皮皮学刷刷变学霸
举一反三
【单选题】To fully understand the writer,we must read not only between the lines,but sometimes __________ the lines.
A.
within
B.
beyond
C.
beside
D.
among
【简答题】Not only the Writer brothers but also their father ______ (be )there.
【单选题】To fully understand the writer, we must read not only between the lines, but sometimes _______ the lines.
A.
beyond
B.
within
C.
among
D.
beside
【多选题】关于机械波的概念,下列说法中正确的是 ( )
A.
质点振动的方向总是垂直于波传播的方向
B.
简谐波沿长绳传播,绳上相距半个波长的两质点振动位移的大小相等
C.
任一振动质点每经过一个周期沿波的传播方向移动一个波长
D.
相隔一个周期的两时刻,简谐波的图像相同
【单选题】关于机械波的概念,下列说法中正确的是
A.
处于平衡位置时质点的动能为零，势能最大
B.
处于平衡位置时质点的动能和势能都为零
C.
波峰处质点的动能和势能均为零
D.
处于平衡位置时质点的势能为零，动能最大
【单选题】To fully understand the writer, we must read not only between the lines but also ________ the lines to know what is implied in the article.
A.
within
B.
beyond
C.
beside
D.
among
【判断题】An outline can help the writer not only determine what to write but even control the length of the paper.
A.
正确
B.
错误
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