【多选题】触电事故发生后应对触电人员立即采取急救,急救原则为()。
【判断题】压力角越大,有效动力就越大,机构动力传递性越好,效率越高。
【判断题】为防止在多极放大器中由于电源内阻的存在而带来级与级间的影响,常采用腿耦电路。
【简答题】当室外日平均气温连续5d稳定低于5℃时,砌体工程应采取冬期施工措施,应注意( )。 A.冬期施工砂浆试块的留置,除应按常温规定要求外,尚1组与砌体同条件养护的试块,用于检验转人常温28d的如有特殊需要,可另外增加相应龄期的同条件养护的 B、冬期施工期限以外,当日最低气温低于0℃时,也应按冬期施工的规定执行 C、砌体工程冬期施工应有完整的冬期施工方案 D、气温根据当地气象资料确定
【单选题】In the passage the author implies that______.
A.
it is always difficult to work out international agreements to cut down emissions harmful to the ozone layer
B.
it is no longer easy to reach international agreements relating to the environment
C.
the world has recently become aware of the threat of global warming
D.
the problem of global warming has largely been solved