检测一组病人的血型（A、B、O、AB）是属于（）
A.离散型定量变量
B.连续型定量变量
C.名义变量
D.有序变量
E.等级变量
参考答案：C
The cakes were delicious. He'd like to have _____ third one,
because _____ second one he ate was too small. [ ]
A. a; a
B. /; the.
C. the; a
D. a; the
高架绝缘斗臂车应存放在（）通风的车库内，其绝缘部分应有（）措施。
