Which of the following is TRUE about nuclear？
A. Nuclear is cost efficient.
B. Nuclear is the alternative energy to oil.
C. Industrialized countries are not likely to build any new plant.
D. Industrialized countries will make a nuclear energy-development plan.
某碱液25．00 mL以0．100 0 mol·L-1 HCl标准溶液滴定至酚酞褪色，用去20．00 mL，再用甲基橙为指示剂继续滴定至变色，又耗了6．50 mL，此碱液的组成为()。
A. NaOH
B. NaOH+Na2CO3
C. NaHCO3+Na2CO3
D. Na2CO3
The fact that there was water on Mars brings NASA the following with the exception of ______.
A. relief
B. fatigue
C. excitement
D. pleasure
数控机床是计算机在____方面的应用。
A. 数据处
B. 人工智能
C. 辅助设计
D. 实时控制
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