机油泵出口压力为≤()KPA。
A、900
B、800
C、950
D、850
参考答案:C
I listened to Dr. Johnson’s lecture about biology, but I failed to get its key ____.
A.words
B.notes
C.messages
D.points
甘草皂苷易溶于()
A.无水乙醇
B.丙酮
C.乙醚
D.三氯甲烷
E.稀氨水