普通股股票被认为比公司债券能更好地避免购买力风险。 ( )
参考答案:对
出现柏油样便,提示消化道出血量在
A.50~l00mlB.20~30mlC.>5mlD.70~100mlE.<400ml以上
Students should not be allowed _____ part-time jobs.[ ]
A. have
B. having
C. had
D. to have