Cathy is taking notes of the grammatical

多发性骨髓瘤的最终诊断主要依靠

A．骨髓片上见到骨髓瘤细胞

B．贫血

C．血片上有缗钱状红细胞

D．容易骨折

E．血沉加快

首先提出战斗或逃避的反应学说的学者是()

A．坎农

B．塞里

C．英格尔

D．沃尔夫

E．斯金纳

焦炭塔预热时，对分馏操作有何影响？

If the market demand for a product increases in a competitive market, then in the short run the quantity supplied by an individual firm will:（）

A. decrease and the firm will generate economic profits.

B. increase and the firm will generate economic profits.

C. increase and the firm will generate economic losses.

有一个折弯而成的方形构件，边长为100mm×100mm，板厚位5mm，其展开料位（）mm。

A.360

B.400

C.380

D.420