挤出胀大现象
参考答案：高分子熔体在加工过程中从口模处挤出时，或用毛细管流变仪、熔体指数仪进行进行黏度测量时，出口处的直径大于流道直径的现象
读短文，判断正(T)误(F)。
Hello! My name is Bill. I am eleven. I like travelling. I want to tell you my travel plan. I want to go to Henan
with my parents this summer vacation. We want to go there by train. I want to go to Shaolin Temple (寺) and
learn Wushu there. My father wants to climb the hill. He thinks it's great. My mother wants to take pictures.
She thinks it's exciting. I think I will have fun there.
( ) 1. Bill is going to Shaolin Temple this summer vacation.
( ) 2. Bill is going to Henan by plane.
( ) 3. Bill's father wants to row the boat.
( ) 4. Bill's mother doesn't like taking pictures.
( ) 5. Bill wants to see monkeys in Shaolin Temple.
下列哪些方法能使涂膜减少锈蚀（）
A、处理底层后不需要用底漆
B、不管底材如何，喷涂较厚涂膜
C、金属表面未经处理，直接喷涂防锈漆
D、金属底材一定要完全除锈并涂装底漆
