A:NH3·H2O 的导电性比NaOH溶液弱得多
B:0.1mol/L 的NH3·H2O 的pH值大于7
C:NH4Cl 的水溶液的pH值小于7
D:5mL 1mol/L的NH3·H2O跟10mL 0.5mol/L的HCl恰好完全反应
已知在Rt△ABC中,∠C=90°,BC=3AC,那么∠A=____ 度.
Mother came into my study with a cup of milk in one of her hands, and an apple in ______.