对于选择了全额套期保值的企业而言，在以下什么情况下必须同时通过在期货市场上增仓或减仓操作来调整套期保值头寸以达到期货头寸等于或小于风险敞口的目的。（）

A.当库存水平发生变化时
B.当期销售量小于当期采购量时
C.当期销售量等于当期采购量时
D.当企业盈利水平发生变化时

You would imagine that sleeping was a quiet and peaceful experience but in reality，our brains are more active during some stages of sleep than when we are______。

2023-05-26 从业资格银行证券

Dealers often tell customers that if their car gets wrecked in a crash they could be financially harmed because regular insurance may not______the entire amount owed on the loan。

2023-05-26 从业资格银行证券

Responsible parents should show____love to their children and make them grow healthily.

2023-05-26 从业资格银行证券

No single individual can____handle this kind of responsibilities alone.

2023-05-26 从业资格银行证券

April fifteenth represents a special date for people in USA. But it is ________ holiday.

2023-05-26 从业资格银行证券

______ and predictable increases in research funding will allow the United States to accomplish a great deal.

2023-05-26 从业资格银行证券

In low and middle income countries, heart disease and cancer get much of the attention given to ______ diseases.

2023-05-26 从业资格银行证券

The suspicion that the servant is dishonest has proved（ ）true.

2023-05-26 从业资格银行证券

At the meeting, the manager talked ______about the need for better attendance and punctuality.

2023-05-26 从业资格银行证券

This year, the figures are 27 percent and 53 percent ______.

2023-05-26 从业资格银行证券