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【单选题】
Which of the following phrases in the fifth paragraph indicates the fridge's negative effect on the environment?A.
Hum away continuously.
B.
Climatically almost unnecessary.
C.
Artificially-cooled space.
D.
With mild temperatures.
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反馈参考答案：
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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