通过圆孔的结构为( )
A.眼神经
B.滑车神经
C.上颌神经
D.下颌神经
E.脑膜中动脉
参考答案:C
You, who ______ his good friend, should help him get out of trouble.
A.am
B.is
C.are
D.was
计算题:某阴床入口水中SiO2为6.6mg/L,酸度为3.8mmol/L,残余CO2为0.25mmol/L,周期制水量为4200t,再生一次用40%NaOH2100kg,求碱耗与比耗。