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甲、质点绕同一圆心做匀速圆运动,甲的转动半径是乙的 3/4,当甲转60,45,甲、质点的向心加速度之比_______________。
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【单选题】In recent years, there have been over 30 foreign companies __________ business in this city.
A.
doing
B.
do
C.
to do
D.
done
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A.
reclaimed
B.
acclaimed
C.
proclaimed
D.
claimed
【单选题】选出正确答案 1. In recent years, there have been over 70 foreign companies ________ business in this city
A.
doing
B.
do
C.
to do
D.
done
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