混凝土泵的实际输送量取决于（）。
A、泵的管长
B、混凝土类型
C、发动机功率
D、泵送的距离或高度
E、砂率
参考答案：C, D
They felt ________ it was high tax and low income ________ contributed to the extreme misery of the working people at the bottom of the ladder.
A．/；that
B．that; which
C．that; what
D．/; which
根据李白的《访戴天山道士不遇》中记载，诗中出现了哪几种动物？
