使用无机粘接剂时，联接表面应尽量粗糙。
参考答案：对
If our car had not ________, we would have been here on time.
A．broken out
B．broken into
C．broken away
D．broken down
蝶：蛹
A．细胞：细胞核 B．丑小鸭：白天鹅C．玫瑰：蔷薇 D．青蛙：蝌蚪
