行政机关履行职权时，要遵循权责统一原则。
参考答案：对
Worried about the time _____, Mary had made a list of the sites she wanted to see in Beijing. [ ]
A. adequate
B. available
C. efficient
D. accessible
内胎上的红或黄线表明：（）
A、平衡标记
B、气门芯的位置
C、较轻一侧
D、较重一侧
