《饮片标准通则(试行)》要求炮制品含水量应控制在
A．1%～3%
B．4%～6%
C．7%～13%
D．15%～17%
E．18%～20%
参考答案：C
The old couple chose to live ________ life was cheap, and they moved to a small town years ago.[ ]
A. whose
B. unless
C. when
D. where
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