防爆电气设备运行环境温度一般为()℃。
A、-30~+20
B、-20~+40
C、-10~+60
参考答案:B
When they moved to Canada,the children________the change very well. [ ]
A. adapted to
B. adopted to
C. used to
D. attempted to
2009年我国提出的经济发展目标是年经济增长率为()。
A.6%
B.7%
C.8%
D.9%