催化剂大型装剂时，应防止加剂太快阻塞加料线。
参考答案：对
---You are a good boy!
--- .
A．I’m not
B．Not very good
C．Thank you
D．Yes, please
_______ is said that _______ tourists visit the park every day .
A．That , thousands of
B．It , five thousand of
C．It , thousands of
D．This , three thousand
