原发性慢性肾上腺皮质功能减退症患者,每天食盐摄入量不得少于()。
A.50g
B.40g
C.20~30g
D.30~40g
E.8~10g
参考答案:E
频带传输系统中收端低通的作用是什么?
This is the _____ time in _____ days that he has made the same mistake.[ ]
A. second, third
B. two, three
C. two, third
D. second, three