Levey-Jennings质控图以平均值±3S为（）
A.警告限
B.失控限
C.在控限
D.误差限
E.以上均都不是
参考答案：B
小题1: My uncle works in a hospital. (划线提问)
______ ______your uncle work?
小题2: My sister is eating dinner.(改为否定句)
My sister ______ ______dinner.
小题3:Pandas come from China.(改为同义句)
Pandas ______ ______ China.
小题4: There is a beautiful park near our school.（改为一般疑问句）
______ ______ a beautiful park near your school?
小题5: They often take photos in the park..(用now 改写句子)
They ______ ______ photos in the park now?
当变压器的变比小于1时，变压器为（）变压器。
A.升压
B.降压
C.隔离
D.双圈
小题1: My uncle works in a hospital. (划线提问)