一般规定工作点扬程应小于流量等于零时的扬程，以免水泵进入不稳之区
参考答案：对
Is she tall ____________ short? [ ]
A. to
B. but
C. or
Some _____ are flying kites near the river. [ ]
A. child
B. boy
C. boys
D. childs
