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问题 选择题

在下列实例中，不计空气阻力，机械能不守恒的是（　　）

A．做斜抛运动的手榴弹

B．沿竖直方向自由下落的物体

C．起重机将重物体匀速吊起

D．沿光滑竖直圆轨道运动的小球

答案

A、不计空气阻力，做斜抛运动的手榴弹只受重力，机械能守恒．

B、自由下落的物体只受重力，机械能守恒．

C、起重机将重物体匀速吊起，拉力对重物做正功，机械能增大，故机械能不守恒．

D、沿光滑竖直圆轨道运动的小球，轨道的支持力不做功，只有重力对小球做功，其机械能守恒，

该题选机械能不守恒的，故选：C．

单项选择题

One day while a girl was walking in the woods she found two starving songbirds. She took them home and put them in a small (31) . She cared for them and felt great love for them.

Once the (32) and per of the two birds flew from the cage. Therefore, (33) he flew close, she grasped him (34) . She felt glad, but suddenly she felt the bird go limp. She opened her hand and (35) in horror at the dead bird.

She noticed the other bird moving back and forth on the edge of the cage. She could feel his great need for (36) . She lifted him from the cage and (37) him softly into the air. The bird circled once, twice, three times.

The girl watched delightedly at the bird’ s enjoyment. Her heart was no longer (38) with her loss. Suddenly the bird flew closer and (39) softly on her shoulder. It sang the sweetest melody that she had ever heard.

The fastest way to (40) love is to hold on it too tightly, while the best way to keep love is to give it WINGS!

（37）（）

A.because

B.as

C.if

D.since
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多项选择题

(三) A市甲区的先科技术开发公司与A市乙区的融商投资公司签订了一份联合中开发游戏软件的合同。后来在履行合同过程中，双方发生争议。先科技术开发公司依据合同中的仲裁条款向约定的仲裁委员会申请仲裁，仲裁委员会依法受理了该争议案件。 请分析案例，并回答下列问题：

(2006，85)如果人民法院裁定撤销了本案的仲裁裁决，双方当事人可选择的进一步的处理办法是( )。

A．根据原仲裁条款，申请仲裁委员会重新仲裁

B．向有管辖权的人民法院起诉

C．重新达成仲裁协议并申请仲裁

D．无须达成仲裁协议，即可申请对方所在地的仲裁委员会仲裁
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