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【单选题】
细胞有丝分裂中期的显著特征是A.
核膜消失
B.
染色体的着丝粒排列在赤道板
C.
核仁消失
D.
染色体形成
E.
染色体复制
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反馈参考答案：
举一反三
【单选题】Operational amplifiers, used primarily in analog circuits, are characterized by .
A.
high input impedance, high gain and low output impedance
B.
high input impedance, high gain and high output impedance
C.
low input impedance, low gain and high output impedance
D.
low input impedance, high gain and low output impedance
【判断题】Licensing is primarily used by service organizations and franchising is primarily used by manufacturing organizations.
A.
正确
B.
错误
【单选题】If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the _____.
A.
control air system
B.
forced draft air system
C.
supply air system
D.
ships service air system
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