如果房地产估价人员感到自己的专业能力有限而难以对某一房地产进行估价，则不应接受该项估价委托。( )
参考答案：对
—_____?
—He thinks China is great.[ ]
A. What does your father think of China
B. What does your father like China
C. Does your father like China
D. How does your father think of China
当转子转速到达一个临界转速时，振动高点滞后于重心的相位角（）
A.φ90°
B.φ120°
C.φ180°
D.φ270°
