An airliner has ()way to taxi before it reaches the end of the runway.
A.quite a long
B.quite long
C.a quite long
D.a long quite
A.quite a long
B.quite long
C.a quite long
D.a long quite
A.Whether
B.Whom
C.Which
D.Though
A.wa的值大于80
B.id的值大于60
C.us和sy的和始终是99和100
D.id和wa的和始终是99和100
b,试求其比值Wa:Wb。
ter.
A.appealing
B.attracting
When she was busy tidying the room, her little kid is always ______.
A.under way
B.on the way
C.in the way
D.by the way
Which of the following best states the main idea of the passage?
A.Changes in the French way of life.
B.Criticism of the new life style.
C.The Americanization of France.
D.Features of the new way of life.
First basketball teams were formed ______.
A.around 1898
B.in 1891
C.at the time when YMCA was established
D.when Naismith came to the YMCA training school
Not only ______ polluted, but ______ crowded.
A.was the city, were the streets
B.the city was, the streets were
C.was the city, the streets were
D.the city was, the streets were
两轮A、B分别绕通过其中心的垂直轴向同一方向转动,如题3-9图所示,角速度分别为wA=50rad·s-1,wB=200rad·s-1.已知两轮的半径与质量分别为rA=0.2m,rB=0.1m,mA=2kg,mB=4kg,两轮沿轴线方向彼此靠近而接触,试求两轮衔接后的角速度.