如图所示双泵供油的快速运动回路中，阀3起什么作用？http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/1e82941fba8041cd801274383f9409fb.png
举一反三
- 如图所示双泵供油的快速运动回路中，阀5的名称是什么？http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/2ad067f29e9e4ff190482ca3a0225709.png
- 图示双液压泵供油的快速运动回路，单向阀4在回路中作用是（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/3f40cc42ee424e84a4bbc662bba6b81d.png
- 下面哪个图形是分流阀的图形符号： A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/4a427ac6ca3a451d88b23ac3bd534502.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/bef6c57a0c1c4d6bbfc50082f7edfe14.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/750259c8aa1c4efdb338873df39ffe24.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/5d511af88d8349f1bcf5e8ae6d7b1d09.png" />
- 已知<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/43114282e941476ba93775909fb3f237.png"/>，用拉氏变换法求解微分方程<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/0db291610cb64fa8ad46ae0bd15476b0.png"/> 的结果为（ ） A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/29ff68f02bdd438bb2e16c2a6e1ec18b.png"/> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/0010c1593c9145a4b928548ab38cf426.png"/> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/1f562f2536584121b53c30e4db08df88.png"/> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/f593399cb630435192baa8b3e871b533.png"/>
- 已知系统和初始条件<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/15eb73651c0a4ae094e6de902b6c21ca.png" />求初始状态激励的响应 ( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/d016acd038b04b699e76c2354357c3d2.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/7a10be8f1ce74599a610fd0b9b9eb195.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/4621f442538946fdb897b89a1461e1e1.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201902/61b797beffc74a99b91e1934af1372fb.png" />