影响神经系统发育最重要的激素是()
A.肾上腺素
B.甲状腺激素
C.生长素
D.胰岛素
E.甲状旁腺激素
参考答案:B
能正确表示下列化学反应的离子方程式的是
A.金属铝溶于盐酸中:Al+2H+=Al3++H2↑
B.碳酸钙溶于硝酸中:2H++CO32-=CO2↑+H2O
C.硫酸氢钠溶液中加入碳酸氢钠溶液:H++HCO3-=CO2↑+H2O
D.在澄清石灰水中通入过量的CO2:Ca2++2OH-+CO2=CaCO3↓+H2O
Gun control is a subject _____ American have argued for a long time.
A.of which
B.with which
C.about which
D.into which