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【单选题】
已知配制C35混凝土所用普通水泥P.O52.5的实际强度是55MPa，采用碎石，其回归系数αn=0.46，αb=0.07，该施工单位的强度标准差是3.0MPa，则w/C：A.
0.33
B.
0.50
C.
0.61
D.
0.69
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反馈参考答案：
举一反三
【简答题】考考你的阅读能力。正确的写“T”，错误的写“F”。 Mike is a traveler. He went to many places. Sometimes he travels by plane, sometimes he travels by train. Sometimes he takes a bus and sometimes he goes on foot. He is tired ...
【单选题】There w as so m uch n o i se i n t he c l a s s r oom t hat t he t each e r cou l dn ‟ t m ake h i m s e l f .
A.
heard
B.
hearing
C.
to hear
D.
hear
【简答题】与器官移植排斥反应相关的抗原是
【单选题】Researchers find that when a person tells lies ______.
A.
he uses his unconscious mind
B.
he tends to make some small changes in his behavior
C.
he looks very serious
D.
his blood pressure increases measurably
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