提取分离木脂素类成分时,应该注意什么问题
参考答案:应注意有立体异构体存在的木脂素在受到酸碱作用后容易发生立体异构化。
The Agreement sha1l commence()a satisfactory Medical Report by a doctor nominated by the Company.
A.on the part of
B.in lieu of
C.subject to
D.in accordance with
电动机取、送电源有什么注意事项?