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【单选题】
8月1日，张家港豆油现货价格为6500元/吨，9月份豆油期货价格为6450元/吨，则豆油的基差为()元/吨A.
250
B.
-50
C.
-250
D.
50
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皮皮学刷刷变学霸
举一反三
【单选题】The main function of the Starling mechanism under physiological conditions is
A.
Increase cardiac output
B.
Make the heart index drop
C.
Adjust the balance between stroke volume and returning blood volume
D.
Increase ejection fraction
【单选题】Under physiological conditions, which of the following has the greatest impact on systolic blood pressure?
A.
Change in heart rate
B.
Changes in cardiac output
C.
Changes in peripheral resistance
D.
Changes in circulating blood volume
【单选题】Under physiological conditions, the change range of body temperature is generally about ( )℃.
A.
1
B.
2
C.
3
D.
4
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