主要用在安装方形补偿器时空间不够场合的补偿器是( )。
A．钢质补偿器
B．波形补偿器
C．填料式补偿器
D．管式自然补偿器
参考答案：C
— Where does a panda live? — In .[ ]
A. Canada
B. Australia
C. China
16. I returned home with some roses and only then __________ find my favorite vase missing.
A．I did
B．did I
C．do I
D．I do
