泵的允许吸上真空度与泵的自吸性能没有关系，因此允许吸上真空度较高的泵是：（）
A.往复泵
B.离心泵
C.旋涡泵
D.喷射泵
参考答案：D
终止哺乳后（）
A. * * 血性溢液
B.棕褐色溢液
C.淡黄色或棕褐色溢液
D.乳白色溢液
E.浆液性无色溢液下列情况下 * * 常见溢液分别为上述哪项
—I don't know what I should do.
—If I _____ you, I _____ ask my parents for help. [ ]
A. am; will
B. am, would
C. were; would
D. were; will
