移植心脏病人的血钾应不超过
A.3.0mmol/L
B.3.5mmol/L
C.4.0mmol/L
D.5.0mmol/L
E.6.0mmol/L
参考答案:B
There is much truth in the idea ________ kindness is usually served by frankness. [ ]
A. why
B. which
C. that
D. whether
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