PP的加工温度应略低于PE的加工温度。
参考答案：错
利用凸透镜成放大的像可制成______，利用凸透镜成缩小的实像可制成______．
My grandpa sowed the flower seeds in the garden ______it was the best time for them to grow．
A．where
B．when
C．that
D．until
