JB/T4730.4-2005标准对交流退磁方法是如何规定的?
下列各混合溶液,哪个不具有PH的缓冲能力()。
A. 100ml1mol/LHAC +100ml1mol/LNaOH
B. 100ml1mol/LHCl+200ml2mol/LNH3·H{O
C. 200ml1mol/LHA C +100ml1mol/LNaOH
D. 100ml1mol/LNH4 Cl+100ml1mol/LNH3·H{O
You can ____ your lawyer for the settlement of the dispute(争议).
A. approach
B. get in touch
C. get contact with
D. touch