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敌敌畏具有（）（）（）作用。它的特点是杀虫范围广，速效击倒力强，残效期1-2天，无残毒

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VR技术就是利用高科技设备为我们的各种感觉通路提供接口，来营造一个虚拟的“现实”世界

A. 正确
B. 错误

You are developing a page named Process.aspx in a shopping cart Web application that will be integrated into Certkiller .com's existing e-Commerce Web site. The Process.aspx page allows customers to pay for purchases using their credit cards. The Process.aspx page contains a Button control that confirms the customer's payment and calls an external Web service that charges the customer's credit card. You must implement confirmation and prevent postback unless the customer confirms payment. What should you do?（）

A. Set the OnClientClick property to a JavaScript statement.
B. Set the PostBackUrl property to a JavaScript statement.
C. Set the PostBackUrl property to the URL of a confirmation page.
D. Set the OnClientClick property to the URL of a confirmation page.

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列车减速至规定的速度等级，次一架地面信号显示两个黄色灯光或经侧线发车。此时发送器应向该区段轨道电路发（）移频信号。

A. U2（14.7Hz）
B. UU（18Hz）
C. U2S（20.2Hz）

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全国秸秆产量中用作燃料的约占（）

A. 1/2
B. 1/3
C. 2/3
D. 1/4

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