【单选题】At the Copenhagen conference, all the countries were called on to do all they could to control greenhouse gas emissions________it was too late.
【简答题】A.Some developed countries. B.Countries that wanted to borrow money. C.All the member countries. D.The World Bank.
【简答题】In all countries, employment in this activity never went beyond 1%.
【单选题】( )的工频电流通过人体时,人体尚可摆脱,称为摆脱电流。 A、0.1mA B、2mA C、4mA D、10mA
【单选题】In order to solve the problem of global warming, all countries should ______.
A.
replace all the harmful substances
B.
make progress in economy development
C.
share ideas and bear common responsibilities
D.
develop advanced technology to improve the situation
【多选题】压电式加速度传感器参数中有( )灵敏度( )灵敏度( )灵敏度。
【单选题】( )的工频电流通过人体时,就会有生命危险。 A、0.1mA B、1mA C、15mA D、50mA
【单选题】They do eye exercises twice a day , so ____of them ____glasses.