排放瓦斯必须执行三个原则：撤人、警戒、限量。
参考答案：错
(2013·甘肃兰州名校高三检测)The result was not the same ________ the professor had expected, ________ was rather disappointing.
A．as; which
B．which; as
C．as; that
D．that; which
Which embedded option is most beneficial to a bond issuer（）
A. A conversion option.
B. A floor on a floating rate bond.
C. An accelerated sinking fund provision.
