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【多选题】
肾上腺素对心血管的作用特点是：（）
A.
与心肌细胞膜上的β1受体结合产生正性变变力作用
B.
小剂量时主要兴奋β2受体而使血管舒张
C.
大剂量时主要兴奋α受体引起血管收缩
D.
升压作用不如去甲肾上腺素明显
E.
可引起较强的减压反射
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参考答案：
举一反三
【单选题】________ these experiments were successfully completed would we think of going into humans.
A.
If only
B.
Only if
C.
So that
D.
Even if
查看完整题目与答案
【单选题】With the sun (setting), we stopped (working), (putting) away our tools and were (going) to go home.
A.
setting
B.
working
C.
putting
D.
going
查看完整题目与答案
【判断题】利润表是反映在一定会计期间财务成果的报表。
A.
正确
B.
错误
查看完整题目与答案
【简答题】Today we spent the morning going through our personal belongings .We were looking for items to __ for free at a local park. Not just any items but things people really . Our aim was not to find things...
查看完整题目与答案
【多选题】指南针在战国时期名为(),北宋时期名为(),南宋时期名为()。
A.
司南
B.
指南鱼
C.
指南龟
D.
方向使者
查看完整题目与答案
【单选题】We used to _____every day when we were children.
A.
swim
B.
swimming
C.
be swimming
D.
going swimming
查看完整题目与答案
【判断题】SET协议主要是保障电子邮件的安全。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】把纯净的甲烷和氯气混合于集气瓶中,用玻璃片盖住瓶口,放在光亮的地方,片刻后移动玻璃片,留一条缝,此时观察到的现象有: 1 发生爆炸; 2 瓶口有白雾; 3 瓶内气体颜色变浅; 4 瓶内有油状物。其中正确的是 ( )
A.
①②③
B.
②③④
C.
①③④
D.
①②④
查看完整题目与答案
【单选题】We were going out for a walk ________ it began to rain.
A.
while
B.
before
C.
as
D.
when
查看完整题目与答案
【单选题】_____the wind and waves we were going in the direction of the whirlpool,and nothing could save us.
A.
By
B.
At
C.
To
D.
With
查看完整题目与答案
相关题目：
【单选题】________ these experiments were successfully completed would we think of going into humans.
A.
If only
B.
Only if
C.
So that
D.
Even if
查看完整题目与答案
【单选题】With the sun (setting), we stopped (working), (putting) away our tools and were (going) to go home.
A.
setting
B.
working
C.
putting
D.
going
查看完整题目与答案
【判断题】利润表是反映在一定会计期间财务成果的报表。
A.
正确
B.
错误
查看完整题目与答案
【简答题】Today we spent the morning going through our personal belongings .We were looking for items to __ for free at a local park. Not just any items but things people really . Our aim was not to find things...
查看完整题目与答案
【多选题】指南针在战国时期名为(),北宋时期名为(),南宋时期名为()。
A.
司南
B.
指南鱼
C.
指南龟
D.
方向使者
查看完整题目与答案
【单选题】We used to _____every day when we were children.
A.
swim
B.
swimming
C.
be swimming
D.
going swimming
查看完整题目与答案
【判断题】SET协议主要是保障电子邮件的安全。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】把纯净的甲烷和氯气混合于集气瓶中,用玻璃片盖住瓶口,放在光亮的地方,片刻后移动玻璃片,留一条缝,此时观察到的现象有: 1 发生爆炸; 2 瓶口有白雾; 3 瓶内气体颜色变浅; 4 瓶内有油状物。其中正确的是 ( )
A.
①②③
B.
②③④
C.
①③④
D.
①②④
查看完整题目与答案
【单选题】We were going out for a walk ________ it began to rain.
A.
while
B.
before
C.
as
D.
when
查看完整题目与答案
【单选题】_____the wind and waves we were going in the direction of the whirlpool,and nothing could save us.
A.
By
B.
At
C.
To
D.
With
查看完整题目与答案
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