下列关于审慎的理解,最正确的是()。
A.周密谨慎
B.谨小慎微
C.认真负责
D.全神贯注
E.瞻前顾后
参考答案:A
Liu Xiang has failed over and over again in the past years. And that's _________ he succeeds.
A.what
B.when
C.why
D.where
提高H2S浓度和床层温度,可促使硫酸铝重新转化为氧化铝。