为保证人身安全，除专业人员执行有关规定外，其他人员(包括所携带的物件)与牵引供电设备

五.单词拼写(5分)

1. He gained all his ________(力量) and was ready for a second try.

2. It is healthier to keep a b_______ diet every day.

3. This restaurant was not giving its ______(顾客) energy-giving food.

4. ________ (好奇心)drove Wang Pengwei inside Yong Hui’s restaurant.

5. Wang Pengwei stopped worrying and started advertising the _______(好处) of his food.

如图所示，静止在光滑水平桌面的布带上有一质量为m=1.0kg的小铁块，它离布带的右端距离为L=0.5m，铁块与布带间动摩擦因数为μ=0.1．现用力从静止开始向左以a₀=2m/s²的加速度将布带从铁块下抽出，假设铁块大小不计，铁块不滚动，g取10m/s²，

求：（1）将布带从铁块下抽出需要多长时间？

（2）布带对铁块做了多少功？

两个锐角的和[ ]

A．一定是锐角

B．一定是直角

C．一定是钝角

D．可能是钝角，直角或锐角

起重机吊钩不可用铸钢制造，在检验中发现有轻微的裂纹时，不可施焊修复。（）

A、正确

B、错误

宋代四书