金属烤瓷全冠的合金热膨胀系数(金a)与瓷的热膨胀系数(瓷a)的关系()
A.金a>瓷a
B.金a<瓷a
C.金a=瓷a
D.A、C都对
E.B、C都对
参考答案:A
情景交际。
A: (1) is that blue packbag?
B: It must (2) Xu Fei's.
A: (3) do you say so?
B: Look, the bag is new. Xu Fei (4) a new one yesterday. He would like to travel to (9) .
A: That's great. He can (6) Eiffel (7) there. It's very (8) in the world.
B: Yes, so he bought a new bag to (9) his clothes.
A: Oh, I see. (10) go and give it to Xu Fei.
生漆也称大漆,由于生漆的黏度大,一般不宜()。
A.涂刷
B.喷涂
C.浸涂
D.浇涂