何为局部瓦斯积聚？
参考答案：
采掘工作面及其它巷道中，体积大于0.5m3的空间内积聚的瓦斯浓度达到2%时叫局部瓦斯积聚。
Scientists generally agree that Earth's climate will warm up over the next 50 to 100 years ________ it has warmed in the 20,000 years since Ice Age.
A．so long as
B．as much as
C．as long as
D．as well as
开放日（T日）为信托计划成立日起每满（）个月后的对日。
A.一
B.二
C.三
D.四
