某双链DNA分子片段含腺嘌呤156个,占该片段全部碱基总数的26%,则该分子片段中鸟嘌呤应有[ ]
A.600个
B.300个
C.156个
D.144个
答案:D
The girl had to _____ her journey because of her mother's illness. [ ]
A. leave
B. desert
C. abandon
D. quit
在问诊过程中,做法错误的是()
A.使病人理解无误
B.避免使用专业性强的术语
C.对病人的不良情绪立即批评
D.不强迫病人回答有关隐私问题
E.认真倾听,适当反馈