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【单选题】
Doppler超声在诊断中具有重要地位，其原因是()。A.
可用于各个区域的检查
B.
能定量分析组织的运动
C.
不引起生物效应
D.
用于小器官的检查
E.
在各方面优于一般超声
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举一反三
【单选题】—Well, honey, I'm sorry but I have to board. —________, and God bless you when you are in Libya. [ ]
A.
Enjoy yourself
B.
Do take care
C.
Have a nice trip
D.
Mind your steps
【单选题】将刚体平面运动分解为平移和转动，它相对于基点A的角速度和角加速度分别用wA和eA表示，而相对于基点B的角速度和角加速度分别用wB和eB表示，则
A.
w A = w B , e A = e B ;
B.
w A = w B , e A ¹ e B ;
C.
w A ¹ w B , e A = e B ;
D.
w A ¹ w B , e A ¹ e B .
【单选题】将刚体平面运动分解为平移和转动,它相对于基点A的角速度和角加速度分别用w A 和e A 表示,而相对于基点B的角速度和角加速度分别用w B 和e B 表示,则
A.
w A =w, e A =e B ;
B.
w A =w B , e A ¹ e B ;
C.
w A ¹ w B , e A =e B ;
D.
w A ¹ w B , e A ¹ e B .
【单选题】Student A: May I use your computer this afternoon? Student B: I'm sorry, but I have to finish typing this term paper today. Student A: ______
A.
Do as you please.
B.
It doesn't matter.
C.
Thank you all the same.
D.
Never mind.
【单选题】I'm sorry but I can't help you with your trouble. For______ thing, I have no time; for ____ thing, I'm in trouble myself these days.
A.
one; the other
B.
one; another
C.
the one; the other
D.
the one; another
【单选题】— Well, Jack, I'm sorry but I have to go home. — ________.I hope to hear from you soon. [ ]
A.
Enjoy yourself
B.
Keep in touch
C.
Don't be so sad
D.
So am I
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