人民警察退休后，其警衔应不予保留。( )
参考答案：错
解析： 人民警察离休、退休的，其警衔予以保留，但不得佩带。
Tom showed me his new cell phone, _______ was small but it could change colors in different weather.
A．the screen of whom
B．whom the screen of
C．which the screen of
D．the screen of which
在编制零件加工程序时，分析图纸不属于数控编程中的一部分。
