叶片式泵
参考答案：
凡是依靠高速旋转的叶轮对被输送液体做功的机械，均属于此种类型的泵。
Rod is determined to get a seat for the concert __________ it means standing in a queue all night.
A．so that
B．however
C．even though
D．as if
—Tom doesn't speak English ______ his classmates.
—I agree with you. But his written work is wonderful. [ ]
A. as often as
B. as many as
C. as good as
D. as well as
