具有降低血压作用的矿物质有______。
A．膳食钾
B．膳食钙
C．镁
D．铁
E．钠
参考答案：A,B,C
— Do you know Sam didn’t pass the swimming test this time?
—_____________ His coach said he was the best one in his team.
A．So what?
B．How come?
C．Not at all.
D．I don’t think so.
静脉注射时容易造成溶血现象的是（）
A.低渗溶液
B.高渗溶液
C.等渗溶液
D.等张溶液
E.等压溶液
