大型运输机投掷救灾物资时，必须在 　 [] A． 在目标的正上方投掷 B． 在目

如图所示，一根足够长的水平滑杆SS′上套有一质量为m的光滑金属圆环，在滑杆的正下方与其平行放置一足够长的光滑水平的绝缘轨道PP′，PP′穿过金属环的圆心。现使质量为M的条形磁铁以水平速度v₀沿绝缘轨道向右运动，则

A. 磁铁穿过金属环后，两者将先、后停下来

B. 磁铁将不会穿越滑环运动

C. 磁铁与圆环的最终速度

D.整个过程最多能产生热量v₀²

补全对话。

Harry, Jordan and William are talking about something.

H: Hi, Jordan!     1   .

J: I'm looking at these things. What do you think of them?

H: Well…Hm...    2   . I think they're cool.

W: I don't like sunglasses. I love scarves.     3   .

H: Girls always like scarves.     4   .

J: What do you think of them?

H: Er…I like belt and wallet.     5   .

A. They're my favorite.

B. They're really cool.

C. What are you doing?

D. I can't stand them.

E. I love sunglasses.

对于防伪税控开票子系统顾客，服务单位须向顾客安排一年不少于（）次的回访服务。

A、3

B、4

C、1

D、2

卷烟纸的伸长率与抗张强度均与水分相关，是衡量卷烟纸能否在卷烟机上正常运行的关键指标。按实验检测数据：在一定范围内，水分越高，伸长率（），抗张强度（），而当水分为（）%时，伸长率与抗张强度均较理想。

A、越高

B、越低

C、4.5

D、6.0

E、7.5

Like other men of vision (有识之士) , Maceo had no time for racism, for the false idea that one race of men is better or worse than any other. Some of the whites of Cuba disagreed with him. They were Spanish settlers who thought that white was going to be better than black even in an independent Cuba.
One day Maceo was approached by a Spanish Cuban who suggested that the regiments of independence army should be divided into whites and nonwhites. Maceo made him a reply which became famous in Cuba. "If you were not white," Maceo said to this man, "I would have you shot on the spot. But I do not wish to be accused of being a racialist as you are, and so I let you go, but with the warning that I shall not be so patient another time. The revolution has no color.\

The Spanish Cuban was a black racialist.
A. Right.B. Wrong. C. Doesn’t say.