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【单选题】
纤毛与微绒毛超微结构的主要不同点是A.
纤毛长，微绒毛短
B.
纤毛能摆动，微绒毛不活动
C.
纤毛内有微管，微绒毛内有微丝
D.
纤毛内有微丝，微绒毛内有微管
E.
纤毛表面有细胞膜，微绒毛无
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反馈参考答案：
举一反三
【判断题】The vernier universal angle ruler can measure any angle from 0 to 360 degrees.
A.
正确
B.
错误
【判断题】To measure the angle between two planes, you
must construct a view in which both planes are on edge.
A.
正确
B.
错误
【简答题】What is the measure of the angle that is complementary to a 25° angle?
【单选题】Use a vernier universal angle ruler to measure the workpiece. If the measured angle is greater than 90° and less than 180°, add ( ) to the reading.
A.
90°
B.
180°
C.
360°
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