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【单选题】
圆形直管中作完全湍流时,当输送量、管长和管子的摩擦系数不变,仅将其缩小一半,则流阻変为原来的()倍。
A.
16
B.
32
C.
不变
D.
64
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参考答案：
举一反三
【单选题】山莨菪碱(654-2)抗感染性休克主要是因为它能
A.
抑制迷走神经，加快心跳
B.
扩张血管，改善微循环
C.
松弛支气管平滑肌
D.
兴奋中枢
E.
收缩血管，升高血压
查看完整题目与答案
【单选题】I will apply()the company () the position.
A.
for;to
B.
for;for
C.
To;for
D.
to;to
查看完整题目与答案
【单选题】山莨菪碱抗感染性休克主要是因为它能
A.
兴奋心脏,增加心输出量
B.
解除迷走神经对心脏的抑制
C.
扩张血管,改善微循环
D.
收缩血管,升高血压
E.
松弛支气管平滑肌,解除呼吸困难
查看完整题目与答案
【单选题】654—2抗感染性休克主要是因为它能( )
A.
抗迷走,心跳加快
B.
扩张微血管,改善微循环
C.
松弛支气管平滑肌
D.
兴奋中枢
E.
收缩血管,升高血压
查看完整题目与答案
【单选题】Kelly often helps _ with my math.
A.
my
B.
I
C.
me
D.
mine
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【单选题】In the past I often wrote _____ my parents about my study at school, but now I e-mail them ____ rita@sunshinetown.com.cn or call them ______ 5551 6789 .
A.
for; at; on
B.
to; at; on
C.
to; at; for
D.
for; on; to
查看完整题目与答案
【简答题】I like volleyball and I have a volleyball. I often take it to school and play it with my friends. It’s fun. — Sally Sports are good for me. I like sports. I’m in the school sports club. I often ...
查看完整题目与答案
【单选题】654-2抗感染性休克主要是因为它能( )
A.
抑制迷走神经，加快心跳
B.
扩张血管，改善微循环
C.
松弛支气管平滑肌
D.
兴奋中枢
E.
收缩血管，升高血压
查看完整题目与答案
【单选题】I told my friend Graham that I often cycle the two miles from my house to the town centre but un fortunately there is a big hill on the route. He replied, 'You mean fortunately.' He explained that I s...
A.
extra
B.
excess
C.
surplus
D.
spare
查看完整题目与答案
【简答题】I told my friend Graham that I often cycle two miles from my house to the town centre but unfortunately there is a big hill on the route. He replied, “You mean fortunately.” He explained that I should...
查看完整题目与答案
相关题目：
【单选题】山莨菪碱(654-2)抗感染性休克主要是因为它能
A.
抑制迷走神经，加快心跳
B.
扩张血管，改善微循环
C.
松弛支气管平滑肌
D.
兴奋中枢
E.
收缩血管，升高血压
查看完整题目与答案
【单选题】I will apply()the company () the position.
A.
for;to
B.
for;for
C.
To;for
D.
to;to
查看完整题目与答案
【单选题】山莨菪碱抗感染性休克主要是因为它能
A.
兴奋心脏,增加心输出量
B.
解除迷走神经对心脏的抑制
C.
扩张血管,改善微循环
D.
收缩血管,升高血压
E.
松弛支气管平滑肌,解除呼吸困难
查看完整题目与答案
【单选题】654—2抗感染性休克主要是因为它能( )
A.
抗迷走,心跳加快
B.
扩张微血管,改善微循环
C.
松弛支气管平滑肌
D.
兴奋中枢
E.
收缩血管,升高血压
查看完整题目与答案
【单选题】Kelly often helps _ with my math.
A.
my
B.
I
C.
me
D.
mine
查看完整题目与答案
【单选题】In the past I often wrote _____ my parents about my study at school, but now I e-mail them ____ rita@sunshinetown.com.cn or call them ______ 5551 6789 .
A.
for; at; on
B.
to; at; on
C.
to; at; for
D.
for; on; to
查看完整题目与答案
【简答题】I like volleyball and I have a volleyball. I often take it to school and play it with my friends. It’s fun. — Sally Sports are good for me. I like sports. I’m in the school sports club. I often ...
查看完整题目与答案
【单选题】654-2抗感染性休克主要是因为它能( )
A.
抑制迷走神经，加快心跳
B.
扩张血管，改善微循环
C.
松弛支气管平滑肌
D.
兴奋中枢
E.
收缩血管，升高血压
查看完整题目与答案
【单选题】I told my friend Graham that I often cycle the two miles from my house to the town centre but un fortunately there is a big hill on the route. He replied, 'You mean fortunately.' He explained that I s...
A.
extra
B.
excess
C.
surplus
D.
spare
查看完整题目与答案
【简答题】I told my friend Graham that I often cycle two miles from my house to the town centre but unfortunately there is a big hill on the route. He replied, “You mean fortunately.” He explained that I should...
查看完整题目与答案
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