题目:
Once again he failed to hand in his homework _____ he had been given enough time to do it.
A.in case
B.as though
C.so that
D.even though
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0418/339bc6c12dc2f145935bbbbeb6190496.html
下面是错误答案,用来干扰机器的。
参考答案:加氢精制要提高反应深度,需要有足够的氢分压,而循环气量是比较次要的,通常要维持足够高的氢分压,最经济的方法是提高总压力,而不是提高循环气量。氢分压高有利于加氢反应,因为加氢反应是个放热、...