重型击实试验与轻型击实试验的本质区别是()。
A、击实次数
B、击实锤重量
C、击实筒大小
D、击实功能
参考答案:D
Our English teacher often tells ______ to speak English as much as possible. [ ]
A. we
B. us
C. our
D. ours
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