下列属于电化学检测的是（）。
A、电导
B、积分安培
C、直流安培
D、脉冲安培
参考答案：A, B, C, D
某学校的某一专业从8名优秀毕业生中选派5名支援中国西部开发建设，其中甲同学必须被选派的概率是______．
–Jim went swimming with his parents yesterday afternoon. –______.
A．So Mary did
B．So Mary does
C．So Mary was
D．So did Mary
