如果销售具有较强的周期性，则企业在筹资时不宜过多采取负债筹资。（）
参考答案：对
John's parents work in the hospital. They _____ doctors. [ ]
A. all are
B. are all
C. are both
D. both are
阿司匹林过敏-哮喘-鼻息肉三联症
