浮头式换热器的结构复杂，主要等零部件有（）。A、防冲板 B、挡板 C、浮头管板 D、
题型：多项选择题
问题：
浮头式换热器的结构复杂，主要等零部件有（）。
A、防冲板
B、挡板
C、浮头管板
D、钩圈
题型：多项选择题
| 根据图片提示填空。 | |
1.  | —What is it? —It is a _________. —How's the weather? —It's _________. |
2． | —What does it look like? —It ________ like a _________. |
3． | Li Ming goes to Canada by _________. |
4． | He likes to _________. |
5． | I will lie on the __________ and look at the sky. |