向井内混油时，应控制（），满足（）。
参考答案：混油速度；平衡关系
-You were out when I dropped by your house.
-Oh, I __________ for a friend from England at the airport.[ ]
A. was waiting
B. had waited
C. am waiting
D. have waited
下列哪项不是SLE诊断标准（）。
A.光过敏
B.口腔溃疡
C.关节炎
D.癫痫发作
E.胃溃疡
