图示桁架中杆1的轴力为（ ）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/f6bd8239e7a2488e825ea4627929f513.jpg
举一反三
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/5f9f81d9a1184c2eb383cb81ebbe2768.png，若http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/410a0d9f8b4a4f82a6818a45f4a3b450.png，http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/637f75734cb849caa773da5377f55f5e.png，http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/29aefd40f6c54e788587a2115dd02467.png，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/631634fcf7854ec88eedede14de7c1de.png之间的大小顺序为（ ）<br>
- 单击标准工具栏上的（ ）按钮可以打开“设计中心"面板。1、http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7a8ef85e77f8490babf1302f6cfb317f.png 2、 http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/9cb75f8a10154a279078690a7149876e.png 3、http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/451fea6688f4480fbf86d1a75006cfdc.png 4、http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/0eeb17dcbe1a455f84981040ae19ef0b.png
- 已知http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/4b2b0bc2a81c4059b4ee54fd2d4ca9b8.png，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/1bc083ffe16c4d17a12236cd29409de6.png( )<br>
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/90c19a717ac34717836dbca4afba1bd9.png是由方程http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7648e783c2f24044bb84346d0e07e161.png确定，求http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d24ed3aef9a94d38965289947da528f7.png（ ）
- 求函数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c7a245151812467d85af7a1cf91a4be0.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/917120f5d9354f20ad871d7acfc759d1.png处全微分，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/63eafd5e56d84117ba59026b91c8059e.png（ ）<br>