An analyst does research about order types. The investor wants to profit from a predicted declines in the price of a company which she does not currently own. The most appropriate type of order is:

A. short sale.
B. limit order.
C. stop loss order.

油面上油气一空气混合物遇到明火就可连续燃烧的最低温度称为（）。

A.闪点

B.燃点

C.沸点

D.汽化点