在图中电阻箱接入电路的电阻值是__________Ω，此电阻箱的最大阻值是_________Ω。
6 690；9 999
Young as he is, David has gained _____ rich experience in ______ society. [ ]
A. the; the
B. a; /
C. /; /
D. /; the
精、血、津液均属阴中之阴。( )
