A client who has been using crutches at home for t week reports that he is having trouble using the crutches because his armpits hurt and his fingers tingle. What would be the nurse’s most appropriate response

A. "You need to do more arm exercises. It sounds like your muscles need strengthening. "
B. "That’s normal. As you adjust to the crutches, the discomfort will diminish. "
C. "Be sure to take your pain medication before ambulating. That will help your discomfort. "
D. "Let me watch you ambulate. Your crutches or technique may need some adjustment. "

（2007）在双缝装置实验中，当入射单色光的波长减小时，屏幕上千涉条纹的变化情况是：（）

A.条纹变密并远离屏幕中心

B.条纹变密并靠近屏幕中心

C.条纹变宽并远离屏幕中心

D.条纹变宽并靠近屏幕中心