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【单选题】
质量为 m 的物块 A 和质量为2 m 的物块 B 相互接触放在水平面上,如图所示。若对 A 施加水平推力 F ,则两物块沿水平方向做加速运动。关于 A 对 B 的作用力,下列说法正确的是( ) A .若水平面光滑,物块 A 对 B 的作用力大小为 F B .若水平面光滑,物块 A 对 B 的作用力大小为2F/3 C .若物块 A 与水平面、 B 与水平面的动摩擦因数均为 μ ,则物块 A 对 B 的作用力大小为F/2 D .若物块 A 与水平面的动摩擦因数为 μ , B 与水平面的动摩擦因数为2 μ ,则物块 A 对 B 的作用力大小为A.
B.
C.
D.
D
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【单选题】— Do you mind my parking here? The parking lot is full. — ______. Look at the sign! It says, “No Parking!”
A.
You’d better not
B.
No, I don’t mind
C.
It doesn’t matter
D.
Yes, go ahead
【简答题】1972 年 提出生物膜的“流动镶嵌模型”,该模型突出了膜的 性和膜蛋白分布的 性。
【简答题】1972 年 Sanger 提出生物膜的“流动镶嵌模型”,该模型突出了膜的 性和膜蛋白分布的 性。
【简答题】Many residents objected to _______ in thecommunity parking lotA. being charged for parking B. be charged with parking C. be charged for parking D. charging for parking
【单选题】Many residents objected to _______ in the community parking lot.
A.
being charged for parking
B.
be charged with parking
C.
be charged for parking
D.
charging for parking
【单选题】Many residents objected to _______ in the community parking lot.
A.
be charged for parking
B.
being charged for parking
C.
be charged with parking
D.
charging for parking
【单选题】Why did Larry find a job parking cars?
A.
Because he liked the job.
B.
Because the parking lot was near Hollywood.
C.
To make a living and wait for the opportunity.
D.
To see a lot of film stars and work for them.
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