在制冷设备上设置安全阀,最重要的一点是要求在开启时必须具有足够的()。
参考答案:排气能力
The teachers are said _____ to the new office, where they have better conditions.
A.to move
B.to have moved
C.moving
D.having moved
一般的水质处理需经过几项工艺?