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【单选题】
处于重力场中的静止流体,z轴铅锤向上, z = 0 处函数 U = 0 ,且其单位质量力的分量为 f x = a x ,f y = a y ,f z = a z -g,则其函数为 ( ) 。A.
U = -gz
B.
U = (a z -g)z
C.
U = a x x i +a y y j +(a z -g)z k
D.
U = a x x +a y y +(a z -g)z
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【单选题】Kevin kicked the ball so hard that up _____, higher and higher, until it was a small dot in the sky. [ ]
A.
it flew
B.
flew it
C.
did it fly
D.
fly did it
【单选题】Yi master Fei Changfang asked his followers to climb up to a higher place and wear dogwood to .
A.
have fun
B.
avoid a plague
C.
get together with their families
D.
plant trees
【单选题】Higher and higher up the beanstalk________, but he still couldn't see the top.
A.
climbed Jack
B.
did Jack climb
C.
had Jack climbed
D.
Jack climbed
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