乙炔管道不能与______、______敷设在单独的同一支架上。
参考答案：电缆；电线
Having an outdoor meal is always fun, but it can also be damaging to the planet if ______.
A．planned not carefully
B．not planning carefully
C．not planned carefully
D．not to be planned carefully
试述常用黏膜保护药有哪些及其作用机制。
