If a refrigeration compressor is running continuously without lowering the temperature in
A. a shortage of compressor oil
B. warm food in the refrigerator
C. excessive condenser cooling water
D. a shortage of refrigerant
查看答案
1964年我国还清了前苏联的全部债务。()
参考答案:错误
“天人合一”的观念由陆地上以农耕经济为主的它与自然的关系决定的。()
东汉的王符强调农业的重要性,认为其他行业都不重要。()
参考答案:错误