膝关节CT检查的体位是（）
A.仰卧，头先进
B.俯卧，头先进
C.仰卧，足先进
D.俯卧，足先进
E.坐位，足先进
参考答案：C
根据句意及首字母提示填空。
1. That T-shirt is too short. I want this l________ one.
2. —Do you want these blue p________ ?
—No, I don't.
3. These socks are very cheap. They're only two d________ .
4. The rainbow has seven c________ .I really like it.
符合要求的起始或中间进近定位点，其纵向容差不得大于：（）.
A.±1.0海里
B.±1.5海里
C.±2.0海里
D.±2.5海里
