用MF500型万用表测量电阻时,指针应在标度尺的()。
A、0~1/2区域
B、1/2~2/3区域
C、中间区域
D、任意区域
参考答案:C
Your father is sleeping. You'd better ___________.
A.not to wake him up
B.not to wake up him
C.not wake up him
D.not wake him up
人体各组织器官对X射线的衰减程度最大的是()
A.骨骼
B.肌肉
C.脂肪
D.空气
E.软组织