个人年度结汇总额为每人每年等值()美元。
A.2000
B.5000
C.10000
D.50000
参考答案:D
氨茶碱的安全血药浓度为()
A.1~5μg/ml
B.6~15μg/ml
C.16~20μg/ml
D.21~30μg/ml
E.31~40μg/ml
Mr.Jones was tired , he will()over his duty of look out to another sailor.
A.take
B.think
C.hand
D.get