基础研究领域的重大发现通常能孕育出新的知识革命,而新的知识革命则意味着知识体系与知识结构的大调整、大变革与大创新。
参考答案:对
Why didn't you make me a telephone call yesterday? I _____ about it.
A.should be told
B.ought to have been told
C.should have told
D.ought to be told
氯氧化处理常用的药剂有()。
A.氯气
B.氯的含氧酸及其钠盐、钙盐
C.二氧化氯
D.都是