杯中原有浓度为18%的盐水溶液100ml，重复以下操作两次，加入100ml水，充分配合后，倒出100ml溶液，问杯中盐水溶液的浓度变成了多少？

A.10ml乙醇加入100ml水

B.将10ml乙醇加水稀释到100ml

C.100ml乙醇加10ml水

D.10ml乙醇加90ml水

E.90ml乙醇加10ml水

A.②0.1mL/100mL～0.8mL/100mL

B.②0.1mL/100mL～0.6mL/100mL

C.②0.1mL/100mL～0.9mL/100mL

D.②0.1mL/100mL～1.0mL/100mL

A.60mL

B.40mL

C.50mL

D.10mL

A.（0.1～0.5）mL/100mL。

B.（0.2～0.5）mL/100mL

C.（0.2～0.6）mL/100mL

D.（0.1～0.7）mL/100mL

A.50ml

B.100ml

C.150ml

D.200ml

E.250ml

A.4mol/L

B.2mol/L

C.5mol/L

D.1mol/L

E.3mol/L

A.①0.2mL/100mL

B.②0.3mL/100mL

C.③0.4mL/100mL

D.④0.7mL/100mL

A.100mL 1mol/L HAc＋100mL 1mol/L NaOH

B.100mL 1mol/L HCl＋200mL 2mol/L NH3·H2O

C.100mL 5mol/L NaOH＋1mL 0.1mol/L HCl