Your company has a main office and one branch office. All servers run Windows Server 2003 Service Pack 2 (SP2).The main office has a third-party gateway device named Gateway1. Gateway1 is connected to the internal network and the Internet. Gateway1 supports IPSec. In the branch office, you have a server named Server1. You create an IPSec policy on Server1.You need to ensure that Server1 can establish an IPSec tunnel to Gateway1. What should you use to configure the IPSec policy?（） ["an IP filter that allows only Internet Control Message Protocol (ICMP) traffic ","an IP filter that allows only TCP traffic on port 1701 ","a pre-shared key for authentication ","Kerberos authenticatio"]
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"]
影响柴油机燃烧过程的主要因素有压缩比、柴油的质量、（）、喷油规律、转速和负荷、燃烧室结构等。 ["喷油提前角","点火提前角","气门迟续角","曲轴转角"]
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"]
简述小学儿童思维的特点。
