预拌混凝土与现浇混凝土是一个概念。
A. 对
B. 错
固定泵项目适用所有高度，泵车项目仅适用于高度15m以内的情况。
A. 对
B. 错
Although they plant trees in this area every year, the tops of some hilla are still_____.
A. vacant
B. bare
C. blank
D. empty
There is no doubt that______of these goods to the others is easy to see.
A. prestige
B. superiority
C. priority
D. publicity
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