题目内容

Surgical removal of the thymus from a neonate (新生儿) would result in drastically depleted numbers of which of the following cell types?

A. B cells
B. Mast cells
C. T cells
D. Plasma cells

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Hassall corpuscles are characteristicof which of the following?

A. Blood
B. Keratinizing cells
C. Spleen
D. Red bone marrow
E. Thymus

直角角焊缝的有效厚度he为1.2 hf。

A. 对
B. 错

产生纵向焊接残余应力的主要原因之一是冷却速度太快。

A. 对
B. 错

当钢材为Q235B与Q345B用手工焊接时,宜采用碳钢E50型焊条。

A. 对
B. 错

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