题目内容

在混凝土中凡粒径为0.15～5mm的沙子称为细骨料，大于5mm的称为粗骨料。

A. 正确
B. 错误

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设计铸件壁厚时，不能仅依靠增加厚度作为提高承载能力的唯一途径。

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在混凝土中凡粒径为0.15～5mm的沙子称为细骨料，大于5mm的称为粗骨料。

A. 正确 B. 错误

调频发射机预加重是多少ｕS？为什么要进行预加重及去加重技术措施？

设计铸件壁厚时，不能仅依靠增加厚度作为提高承载能力的唯一途径。

A. 正确
B. 错误