| In the past, the Park Service focused
on making the big scenic parks more{{U}} (21) {{/U}}and comfortable for
tourists. Roads were paved to allow "windshield visitors" to experience the
grandeur of nature without leaving their cars, and a{{U}} (22)
{{/U}}number of hotels and grocery stores were permitted to open{{U}}
(23) {{/U}}the park boundaries. Now this trend is changing. Plans have been made to{{U}} (24) {{/U}}the parks to their natural condition as much as possible. The objective of such a move would be to secure the preservation of the parks for future generations,{{U}} (25) {{/U}}allowing present-day visitors to experience pure wilderness,{{U}} (26) {{/U}}from any obvious signs of civilization -- an opportunity which is quickly disappearing in the twentieth century.{{U}} (27) {{/U}}plans call only{{U}} (28) {{/U}}a r A. released B. devoid C. free D. resulted [判断题]题干：对无故停班达2日以上的进站班车，客运站经营者应当报告当地道路运输管理机构。
A.正确 B.错误 [判断题]第一次国共合作与第二次国共合作的最大相同点是都有一个两党承认的政治纲领。( )
A.正确 B.错误 [单选题] 缓冲器的工作原理与减振器相同，一方面借助压缩弹性元件来缓和冲击作用力；另一方面在变形过程中（ ）。
A.减轻振动 B.吸收冲击能量 C.减小纵向力 D.减小车辆冲击速度 [单选题]巴比妥类中毒引起死亡的原因是( )
A.心脏骤停 B.肾功能衰竭 C.呼吸中枢麻痹 D.惊厥 [判断题]装设接地线应由两人进行(经批准可以单人装设接地线的项目及运维人员除外)。
A.正确 B.错误 [多项选择]导致用户上网慢的原因有（）。
A. 用户主机问题 B. 终端问题 C. 局方设备端口带宽设置不正确 D. 物理线路存在问题 [填空题]机车信号、列车无线调度通信设备、列车运行监控装置和列尾装置必须全程运转,严禁擅自（ ）。J335
[判断题]PWM是一个脉宽调制信号。
A.正确 B.错误 [判断题]智能电能表底度值可以清零，也可以根据要求设定。
A.正确 B.错误 我来回答: 提交
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