当血钙低于下列哪个数值时，可引起手足抽搐()A.1.4mmol/L(5.5mg/dl)～1.5mmol/L6.0mg/dl)B.1.5mmol/L(6

1.[]当血钙低于下列哪个数值时，可引起手足抽搐()A.1.4mmol/L(5.5mg/dl)～1.5 mmol/L 6.0mg/dl) B.1.5mmol/L(6.0mg/dl)～1.63 mmol/L(6.5mg/dl) C.1.6mmol/L(6.5mg/dl)～1.75 mmol/L(7.0mg/dl) D.1.75mmol/L(7.0mg/dl)～1.88 mmol/L(7.5mg/dl)E.2.0mmol/L(8.0mg/dl)～2.13 mmol/L(8.5mg/dl)ABCDE