In red bone marrow newly formed blood cells enter the circulation. you would expect to see many type of capillaries in red bone marrow.

Sinusoid capillaries are the type of capillaries in red bone marrow.  

Explanation:

Sinusoidal capillaries are specialized capillaries which are uniquely structured with a wider diameter, large gaps between their endothelial cells with absence of the basal lamina. This structure allows for increased permeability and nutrient exchange in the organs present like bone marrow, liver, lymph nodes, spleen, and few endocrine glands. Sinusoidal capillaries can belong to any major type of capillaries like the continuous, discontinuous or fenestrated capillaries depending upon the organ they are serving. Bone marrow is hematopoietic and the sinusoidal capillaries aid in the newly-synthesized blood cells to enter and circulate in the bloodstream .

I’m not really sure