下列物质不是肾小管主动重吸收的是()
A、葡萄糖
B、尿素
C、钾
D、钠
参考答案：B
To our surprise, we got ______ people to attend the meeting as we expected.
A．as twice
B．twice many
C．twice many as
D．twice as many
零件的综合影响系数只对______有影响。
A．平均应力
B．循环特性
C．材料的静强度
D．应力幅
