一般来说，桑树一年四季均可嫁接，而在生产上多以（）为主。
参考答案：春接
甲基硅醇钠，可喷刷在喷涂、滚涂表面起到防水作用。( )
（）doesn’t need to change package of goods or to stop in any place between the origin and destination point.
A. Through transport
B. Transfer transport
C. combined transport
D. Motor transport
