备兑开仓策略预计行情大幅上涨或者大幅下跌时（）此策略。

A.可以采取

B.不应采取

C.可能采取

D.可能不采取

It will be emphasized that commercial space operations are inherently complex, longterm, capital-hungry, and set by a variety of risks.

A．beset by

B．inset by

C．preset by

D．reset by