严格地讲,汽车修补漆应包括();();();()等种类,是一套完整的涂装系统。
参考答案:底漆、腻子、中涂、面漆
I think people must have found it quite_____delight when colour TV was first broadcast in___1920s.
A.不填; the
B.a; 不填
C.a; the
D.不填; 不填
倒虹管必须做闭水试验。闭水试验应在管道灌满水经()h后进行。