某科考队结束了两个月的海上考察，于4月21日返回到P地。下图为P地所在区域当日某

（3分）在“验证牛顿运动定律”的实验中，保持小车的质量不变，改变所挂钩码的数量，多次重复测量。在某次实验中根据测得的多组数据在坐标纸上画出a—F关系的点迹，如下图所示。经过分析，发现这些点迹存在一些问题，产生这些问题的主要原因可能是（     ）

A．轨道与水平方向夹角太大

B．轨道保持了水平状态，没有平衡摩擦力

C．所挂钩码的总质量太大，造成上部点迹有向下弯曲趋势

D．所用小车的质量太大，造成上部点迹有向下弯曲趋势

In a country that defines itself" by ideals, not by shared blood, who should be allowed to work and live here In the wake of the Sept. 11 attacks these questions have never seemed more pressing.

On Dec. 11, 2001, as part of the effort to increase homeland security, federal and local authorities in 14 states staged " Operation Safe Travel"—raids on airports to arrest employees with false identification. In Salt Lake City there were 69 arrests. But those captured were anything but terrorists, most of them illegal immigrants from Central or South American. Authorities said the undocumented worker’s illegal status made them open to blank mall by terrorists. Many immigrants in Salt Lake City were angered by the arrests and said they felt as if they were being treated like disposable goods. Mayor Anderson said those feelings were justified to a certain extent. "We’re saying we want you to work in these places. We’re going to look the other way in terms of what our laws are, and then when it’s convenient for us, or when we can try to make a point in terms of national security, especially after Sept. 11, then you’re disposable. There are whole families being uprooted for all of the wrong reasons. " Anderson said.

If Sept. 11 had never happened, the airport workers would not have been arrested and could have gone on quietly living in America, probably indefinitely. Ana Castro, a manager at a Ben & Jerry’s ice cream shop at the airport, had been working 10 years with the same false Social Security card when she was arrested in the December airport raid. Now she and her family are living under the threat of deportation. Castro’s case is currently waiting to be settled. While she awaits the outcome, the government has granted her permission to work here and she has returned to her job at Ben & Jerry’s.

By saying "... we’re going to look the other way in terms of what our laws are", Mayor Anderson means "（）".

A．we will turn a blind eye to your illegal status

B．we will examine the laws in a different way

C．there are other ways of enforcing the law

D．the existing laws must not be ignored

试述特殊的普通合伙企业的责任承担形式。

我国水资源严重缺乏，人均水资源量相当于世界平均水平的（）。

A．1/5

B．1/4

C．1/3

D．1/2

对于冠脉CTA，叙述错误的是（）。

A.回顾性ECG门控可扫描心率范围广

B.心率＞80次/分时，最佳相位通常位于收缩期

C.对比剂采用静脉团注

D.前瞻性ECG门控扫描剂量低，并可进行心功能评估

E.适当的心率控制可提高检查成功率