机体内最重要的调节方式是()
A.神经调节
B.体液调节
C.自身调节
D.反馈调节
E.负反馈调节
参考答案:A
A new educational CD-ROM _____ by Nancy has just come out.[ ]
A. was designed
B. designed
C. designing
D. was designing
化工厂送来盐酸一车,测其比重1.16g/cm3,取1ml稀释至1000ml,取其中100ml于锥形瓶中,用C(NaOH)=0.1mol/L标准溶液滴至甲基橙终点消耗9.50ml,求盐酸浓度?(Cl分子量为35.5)