单项选择题

在中国，运动员使用兴奋剂只会受到罚款，禁赛和终身禁赛，不会追究法律责任。( ) A. 对 B. 错

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单项选择题

Combine the following three sentences together using ellipsis:
By whom was it ordered?
For whom was it ordered?
I don’t know.
A、I don’t know by whom it was ordered and for whom it was ordered.
B、I don’t know by whom and for whom was it ordered.
C、I don’t know by whom and for whom it was ordered.
D、I don’t know who ordered it and for whom.

某商品混凝土的实验室配合比为1∶2.1∶4.0，W/C=0.60，商品混凝土的体积密度为2410kg/m3。求1m3商品混凝土各材料用量。

答案：正确答案：1252kg