新氢缓冲罐中的凝液是由氢气中夹带的微量烃类冷凝聚集后产生的。
参考答案：对
It is rather ______ that we still do not know how many species there are in the world today.
A．misleading
B．embarrassing
C．boring
D．demanding
我国的标准工作时间制度是怎样规定的？
