While suctioning a client’s laryngectomy tube, the nurse should insert the catheter

A. about 1 to 2 inches.
B. as the client exhales.
C. until resistance is met, then withdraw it 1 to 2 cm.
D. until the client begins coughin

某同学用多用电表电阻档测量电阻时，选用“×100”档，发现指针偏角太小，他便断开电阻，将选择开关选到倍率为______挡，并进行欧姆调零再次测量，指针指示在图示位置，则所测电阻的阻值为______Ω．