Traveling with an open mind and practicing an art are also ways of learning.

六淫中，那一项邪气易阻遏气机，损伤阳气（）A.风邪B．寒邪C．暑邪D．燥邪

单项选择题六淫中，那一项邪气易阻遏气机，损伤阳气（）

中国药典采用抗生素微生物检定法测定含量的药物（）A.罗红霉素B．阿莫西林C．庆大霉素D．盐酸四环素

单项选择题中国药典采用抗生素微生物检定法测定含量的药物（）

The following are the durations in minutes of a sample ...

单项选择题The following are the durations in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. Time (in minutes) Relative Frequency 0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 25 but less than 30 0.07 30 or more 0.02 If 1,000 calls were randomly sampled, how many calls laasted under 10 minutes?
A、220
B、370
C、410
D、590