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【多选题】
体系温度函数t=f(θ,x,y,z),下面关于温度函数对时间θ偏导数、全体导数及随体导数说法正确的是()
A.
t对θ的偏导表示温度随时间的变化，而其他量不随时间变化
B.
t对θ的全体导数表示不同时刻不同空间的温度变化，但与观察者的运动无关
C.
t对θ的随体导数表示流场质点上温度随时间和空间的变化率
D.
以上说法都正确
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参考答案：
举一反三
【单选题】一Everybody is going to climb the mountain. Can I go too, mum? —__________Wait till you are old enough, dear．
A.
will you?   
B.
Why not?    
C.
I hope so     D.I’m afraid not
查看完整题目与答案
【判断题】Michelle is old enough to do activities in New York.
A.
正确
B.
错误
查看完整题目与答案
【简答题】某双原子理想气体1mol从始态 350K , 200KPa 经过如下五个不同过程达到各自 的平衡态,求各过程的功。 (1)恒温可逆膨胀到 50kPa ; (2)恒温反抗 50kPa 恒外压不可逆膨胀; (3)恒温向真空膨胀到 50kPa ; (4)绝热反抗 50kPa 恒外压不可逆膨胀。
查看完整题目与答案
【单选题】The panda is 20 months old now. She is _____ look after herself. [     ]
A.
old enough
B.
enough old
C.
enough old to
D.
old enough to
查看完整题目与答案
【单选题】研究发现，市面上的X饮料的Y成分可以抑制鼻病毒．实验证实，鼻病毒是引发感冒的罪魁祸首．因此，经常喝X饮料的人将减少引发感冒的风险． 以下哪项如果为真，最能削弱上述观点？( )
A.
不同条件下的实验，可以得出类似的结论
B.
已经感冒的患者喝了X饮料后并未发现病情好转
C.
Y成分可以抑制鼻病毒，也可以对人的免疫系统产生负面作用
D.
Y成分的作用可以被X饮料的Z成分中和
查看完整题目与答案
【多选题】what would Michelle Wie say to a 15-year-old Michelle Wie?
A.
work out
B.
have fun
C.
back in a schhedule
D.
learn as much as you can
E.
do whatever you want
F.
enjoy the experience enjoy the ride
G.
get your education
查看完整题目与答案
【简答题】作业:2.22某双原子理想气体1mol从始态350K,200kPa经过如下四个不同过程达到各自的平衡态,求各过程的功W。 (1)恒温可逆膨胀到50kPa; (2)恒温反抗50kPa恒外压不可逆膨胀; (3)绝热可逆膨胀到50kPa; (4)绝热反抗50kPa恒外压不可逆膨胀。
查看完整题目与答案
【单选题】According to the passage, Susan Tully is sorry for Michelle because Michelle has to______
A.
grow old quickly
B.
catch up on her schoolwork
C.
write many letters every day
D.
work late in the evening
查看完整题目与答案
【单选题】Natalie, Michelle and Anthony have to be at school by 8:45 a.m. Michelle is never late for school. On Monday Anthony was late for school. If these statements are true, only one of the sentences below ...
A.
Natalie is sometimes late for school.
B.
Anthony sometimes arrives after Michelle.
C.
Natalie sometimes arrives after Michelle.
D.
Anthony always arrives after Michelle.
查看完整题目与答案
【判断题】设置实际踏板深度是否正确
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】一Everybody is going to climb the mountain. Can I go too, mum? —__________Wait till you are old enough, dear．
A.
will you?   
B.
Why not?    
C.
I hope so     D.I’m afraid not
查看完整题目与答案
【判断题】Michelle is old enough to do activities in New York.
A.
正确
B.
错误
查看完整题目与答案
【简答题】某双原子理想气体1mol从始态 350K , 200KPa 经过如下五个不同过程达到各自 的平衡态,求各过程的功。 (1)恒温可逆膨胀到 50kPa ; (2)恒温反抗 50kPa 恒外压不可逆膨胀; (3)恒温向真空膨胀到 50kPa ; (4)绝热反抗 50kPa 恒外压不可逆膨胀。
查看完整题目与答案
【单选题】The panda is 20 months old now. She is _____ look after herself. [     ]
A.
old enough
B.
enough old
C.
enough old to
D.
old enough to
查看完整题目与答案
【单选题】研究发现，市面上的X饮料的Y成分可以抑制鼻病毒．实验证实，鼻病毒是引发感冒的罪魁祸首．因此，经常喝X饮料的人将减少引发感冒的风险． 以下哪项如果为真，最能削弱上述观点？( )
A.
不同条件下的实验，可以得出类似的结论
B.
已经感冒的患者喝了X饮料后并未发现病情好转
C.
Y成分可以抑制鼻病毒，也可以对人的免疫系统产生负面作用
D.
Y成分的作用可以被X饮料的Z成分中和
查看完整题目与答案
【多选题】what would Michelle Wie say to a 15-year-old Michelle Wie?
A.
work out
B.
have fun
C.
back in a schhedule
D.
learn as much as you can
E.
do whatever you want
F.
enjoy the experience enjoy the ride
G.
get your education
查看完整题目与答案
【简答题】作业:2.22某双原子理想气体1mol从始态350K,200kPa经过如下四个不同过程达到各自的平衡态,求各过程的功W。 (1)恒温可逆膨胀到50kPa; (2)恒温反抗50kPa恒外压不可逆膨胀; (3)绝热可逆膨胀到50kPa; (4)绝热反抗50kPa恒外压不可逆膨胀。
查看完整题目与答案
【单选题】According to the passage, Susan Tully is sorry for Michelle because Michelle has to______
A.
grow old quickly
B.
catch up on her schoolwork
C.
write many letters every day
D.
work late in the evening
查看完整题目与答案
【单选题】Natalie, Michelle and Anthony have to be at school by 8:45 a.m. Michelle is never late for school. On Monday Anthony was late for school. If these statements are true, only one of the sentences below ...
A.
Natalie is sometimes late for school.
B.
Anthony sometimes arrives after Michelle.
C.
Natalie sometimes arrives after Michelle.
D.
Anthony always arrives after Michelle.
查看完整题目与答案
【判断题】设置实际踏板深度是否正确
A.
正确
B.
错误
查看完整题目与答案
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