Given： If class Donkey is invoked twice， the first time without assertions enabled，and the second time with assertions enabled， what are the results？（） ["no output","no outputassert is on","assert is on","no outputAn AssertionError is thrown.","assert is onAn AssertionError is thrown."]
面对顾客抱怨与顾客投诉应坚持什么样的理念？
简述顾客服务的基本原则。
FeO具有NaCl型结构。假设Fe与O的原子数目相等，计算其密度。Fe的离子半径为0.074nm，氧离子的半径为0.140nm。
汽车允许间隙
公司法
