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【判断题】
电镜下， 染色质由颗粒与细丝组成，常染色质部分呈稀疏状， 电子密度低，而异染色质则甚为浓密， 呈高电子密度。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】During last summer vocation, I decided to find a part-time job. During last summer vocation, I decided that ______.
【简答题】During last summer vocation, I decided to find a part-lime job. During last summer vocation, I decided that ______ .
【多选题】下列关于液压泵的分类正确的是()
A.
按泵的结构可分为齿轮泵、叶片泵及柱塞泵
B.
按泵的输油方向能否改变可分为单向泵和双向泵
C.
按泵的输入的流量能否调节可分为定量泵和变量泵
D.
按泵的额定压力的高低可分为低压泵、中压泵和高压泵
【单选题】I_____at a summer camp in New York last summer and enjoyed supervising a group of four children.
A.
have worked
B.
have been working
C.
will have worked
D.
worked
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