在x4中，当x=______时，这个分数化简后是1；当x=______时，这个分

如图所示，在匀速转动的圆筒内壁上有一个小物体圆筒一起运动，小物体所需要的向心力由以下哪个力来提供

A．重力

B．弹力

C．静摩擦力

D．滑动摩擦力

X、Y、Z和W代表原子序数依次增大的四种短周期元素，X原子核内没有中子，在周期表中，Z与Y、W均相邻；Y、Z和W三种元素的原子最外层电子数之和为17．则下列有关叙述正确的是（　　）

A．Y、Z和W三种元素可能位于同一周期

B．上述元素形成的氢化物中，W的氢化物相对分子质量最大，熔沸点最高

C．Y和W所形成的含氧酸均为强酸

D．X、Y、Z和W可以组成原子的物质的量之比为5：1：4：1的离子化合物

认真阅读“给定资料”，简要回答下面两题。

“给定资料4”中提到，消费者在“面对合法权益受到侵犯时，选择了‘默默忍受’，成为‘沉默的羔羊’。”请根据“给定资料”简要分析出现这种状况的原因。
要求：准确、简明。不超过200字。

下面关于删除文件夹的操作，正确的是（）

A.在“开始”菜单中选择“程序→MS-DOS方式”选项，然后在DOS状态下执行RD

B.在资源管理器窗口中，先选定要删除的文件夹，然后按DEL键

C.在资源管理器窗口中，用鼠标右键单击要删除的文件夹，在弹击的快捷菜单中选择“删除”选项

D.在“开始”菜单中选择“运行…”选项，在弹出的“运行”对话框中输入RD命令

The Commission is expected to propose allowing people to choose which legal jurisdiction they would come under, based on their (1) or their residency. But the proposal is set to (2) because of the very different laws on divorce that apply across the EU. The Commission wants to (3) problems over which law to apply when, for example, a married couple from one member state is (4) in another member state or when the couple is of different EU nationalities.
The (5) of member states are said to be (6) the idea and responded positively to a (6) which followed the (8) of a Commission Green Paper. With 15 percent of German divorces each year involving couples of different nationalities, the government of Berlin (9) see resolved the issue of which laws should apply.
But some member states are expected to resist the (10) which would involve allowing different divorce laws to be applied in their countries. For example, in Ireland where the divorce law states a couple must have been separated for four years, establish that their marriage has broken down and be offered (11) , a couple from Sweden could apply to an Irish court to allow them to divorce under Swedish law, where divorce can be (12) quickly.
The Irish government’s (13) to the Commission on the Green Paper stated: "Ireland is not in favor of allowing (14) to choose the applicable law, as this could be open to abuse.., such abuse would be likely to (15) most on divorce regimes, such as that of Ireland, which require a relatively long separation period." Ireland, like the UK, however, is allowed to choose whether to "opt-in" to such a proposal under rules agreed in the Amsterdam treaty. Malta has no such (16) but could (17) the proposal in the Council of Ministers since (18) approval will be required.
"It is going to lead to (19) ," said Geoffrey Shannon, Irish expert on the Commission on European Family Law, which examines the (20) of EU family law.
The proposal would also mean that judges would have to be trained in the divorce law of all 25 member states.