酸碱指示酸变色范围的pH值计算式是
A.pH=-lg[H+]B.pH=pKC.pH=pK1n1D.pH=pK1n-1E.pH=pK1n±d1
参考答案:E
国际()接受查询,但对查询结果不负补偿责任。
A.平常函件
B.给据函件
C.挂号小包
D.航空包裹
Vessel in distress()indicate their position by any method.
A.cannot
B.are not allowed
C.have the right
D.should get permission to