往复泵的效率一般都在什么以上?
参考答案:
往复泵的效率一般都在70%以上。
-_____?
-He is friendly and polite. [ ]
A. What does he look like
B. What does he like
C. What is he like
D. What is he alike
下列呈黏液脓性鲜血便同时伴里急后重的疾病是()
A.溃疡性结肠炎
B.直肠息肉
C.肠结核
D.消化性溃疡
E.急性细菌性痢疾