混凝土标准养护室的温度为（）。 A.20±1℃ B.20±2℃ C.20±3℃_爱下问搜题

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问题单项选择题

混凝土标准养护室的温度为（）。

A.20±1℃

B.20±2℃

C.20±3℃

答案

参考答案：B

填空题

短文填空。

mean, take, wash, look at, on, slow, clean, while, when, you, boy, child

     Bob lived in a small town. Later, he got a job in a big city so he had to move there with his wife and
two 1______.
     2______ the first Saturday in their new home, Bob 3______ his new red car out of the garage (车库).
He 4______ it when a neighbor came by. 5______ he saw Bob's new car, the neighbor stopped and 6______
it for a minute. Then Bob turned and saw him.
     The neighbor said, "That's a nice car. Is it 7______?"
     "Sometimes" Bob answered.
     The neighbor was puzzled. "Sometimes?" he said, "What do you 8______ ?"
    Bob answered 9______, "Well, when there's a party in town, it belongs to my daughter. When there's a
football game somewhere, it belongs to my son. When I've washed it, and it looks really nice and 10______,
it belongs to my wife. And when it is dirty, it's mine."

单项选择题

接触网的步行巡视不少于两人，其中一人的安全等级不得低于（）。

A、一级

B、二级

C、三级

D、四级