题目内容

Which of the following options is NOT a typical usage of the present perfect tense?

A. Completed actions at an indefinite time/general experience
B. Actions completed in the past at a definite time
C. Something which began in the past and continues at the time of speaking
D. Past actions with present results

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Which of the following options is NOT a typical usage of the present simple?

A. Habits
B. Routines
C. Facts
D. Actions in progress at the time of speaking

提高混凝土拌合物的流动性，可采取的措施是( )。

A.增加单位用水量
B.提高砂率
C.增大水胶比
D.在保持水胶比一定的条件下，同时增加水泥用量和用水量

以下不属于混凝土配合比设计中三个重要参数的是( )。

A.单位用水量
B.最小水泥用量
C.砂率
D.水胶比

夏季混凝土施工时，因为温度较高，应考虑加入的外加剂是( )

A.减水剂
B.引气剂
C.缓凝剂
D.早强剂