长期鼻饲者应每天进行口腔护理()次,并定期更换胃管,普通胃管()更换一次,硅胶胃管()更换一次,
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码元同步也可以用外同步和自同步法实现
A. 对
B. 错
在二进制系统中,码元同步也叫位同步,因为一个码元就是代表一个二进制位
A. 对
B. 错
This letter is for a / an ____.
A. best friend
B. classmate in college
C. online friend
D. family member
When did the auther meet his / her friend?
A. 16 years ago.
B. 17 years ago.
C. 18 years ago.
D. 19 years ago.