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【简答题】
一质点在平面上作曲线运动,其速率v与路程s的关系为v=1+s (SI),则其切向加速度以路程s来表示的表达式为____ (SI)
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皮皮学刷刷变学霸
举一反三
【单选题】Smith did the only ______ thing by asking the Indians for food and shelter in their village.
A.
sensitive
B.
sentimental
C.
sensible
D.
sensational
【单选题】由一简支梁的弯矩图(如图所示)得出梁在左、中、右三段上的剪力大小和正负依次是 。
A.
20KN，0，-10KN
B.
10KN，0，-20KN
C.
-10KN，0，20KN
D.
-20KN，0，10KN
【单选题】I looked up the word in a dictionary to ______ its spelling.
A.
verify
B.
identify
C.
confirm
D.
reinforce
【简答题】Match the ailine companies with their Chinese names.
【单选题】I looked up and noticed a snake ________ its way up the tree to catch its breakfast.
A.
to wind
B.
winding
C.
wind
D.
wound
【单选题】Many children, ________ parents are away working in big cities, are taken good care of in the village. [ ]
A.
their
B.
whose
C.
of them
D.
with whom
【简答题】来源于上皮组织的恶性肿瘤是 查看材料
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