主页
学科
搜索
账户
常见问题
当前学科:高级家用电子产品维修工
题目:
单选
第一个蒸汽熨斗是()年生产的。
A . 1926
B . 1965
C . 1980
D . 1988
答案:
<查看本题扣1积分>
查看答案
答案不对?请尝试站内搜索
推荐知识点:
治疗中风闭证痰热腑实证,首选的方剂是()
男,2岁。出生后即发现右眼外上方肿物,大小无明显变化,检查发现肿物2cm×3cm大小,柔软,无压痛,界限清楚。下一步应采取的措施是()
下面关于标记的说法不正确的是( )。
太阳电池极板安装完毕后,在天气晴朗时,检查()是否符合设计规定或产品说明书要求。
急性肾盂肾炎()
人工喂养儿体重7kg,每日能量需要量正确的是()
起重钢丝绳检查是怎样规定?
某黏土试样在200kPa的三轴室压力作用下完全排水固结,然后关闭排水阀门,将三轴室压力升至400kPa,再增加偏应力(δ1-δ3)直至试样破坏。已知该试样的有效黏聚力c'=15kPa,有效内摩擦角ψ'=19°,孔隙压力系数B=0.8,Af=AB=0.29,试确定破坏时的偏应力(δ1-δ3)f
Camping Camping wild is a wonderful way to experience the natural world and, at its best, it makes little environmental influence. But with increasing numbers of people wanting to escape into the wilderness, it is becoming more and more important to camp unobtrusively (不引人注目地) and leave no mark. Wild camping is not permitted in many places, particularly in crowded lowland Britain. Wherever you are, find out about organizations responsible for managing wild spaces, and contact them to find out their policy on camping and shelter building. For example, it is fine to camp wild in remote parts of Scotland, but in England you must ask the landowner's permission, except in national parks. Camping is about having relaxation, sleeping outdoors, experiencing bad weather, and making do without modern conveniences. A busy, fully-equipped campsite (野营地) seems to go against this, so seek out smaller, more remote places with easy access to open spaces and perhaps beaches. Better still, find a campsite with no road access: walking in makes a real adventure. Finding the right spot to camp is the first step to guaranteeing a good night's sleep. Choose a campsite with privacy and minimum influence on others and the environment. Try to use an area where people have obviously camped before rather than creating a new spot. When camping in woodland, a void standing dead trees, which may fall on a windy night. Avoid animal runs and caves, and possible homes of biting insects. Make sure you have most protection on the windward side. If you make a fire, do so downwind of your shelter, always consider what influence you might have on the natural world. Avoid damaging plants. A good campsite is found, not made — changing it should be unnecessary. ometimes you need to make electricity.()
学校安全管理的主要途径是开展有效的()和制定有效的安全管理制度和()。