当基坑开挖深度不大、周围环境允许，经验算能确保土坡的稳定性时，最适宜采用的最经济的挖土方案是（）。 ["放坡挖土","中心岛式挖土","盆式挖土","逆作法挖土"]
公安机关乘坐民航班机押解犯罪嫌疑人，一般押解警力要（）于犯罪嫌疑人 ["2倍","3倍","4倍","5倍"]
Static wep is configured on the access point. you are authenticated and associated to the access point but are unable to obtain an ip address. Which of the following will cause this problem？（） ["invalid radio type selected","no wep key configured on the client","invalid ssid configured","invalid wep key"]
如下（）操作，可以将当前窗口全部复制到剪贴板中。 ["Ctrl+PrintScreen","PrintScreen","Alt+PrintScreen","Alt+Ctrl+PrintScree"]
某公司只销售一种产品，2003年单位变动成本为15元/件，变动成本总额为63000元，共获税前利润18000元，若该公司计划于2004年维持销售单价不变，变动成本率仍维持2003年的30%。要求：计算该产品的销售单价；
外汇期权交易
