I类防爆电气设备外壳表面可能堆积粉尘时，允许最高温度为+150℃（）
参考答案：对
某城市去年绿化植树30504900棵，这个数读作______，省略万后面的尾数后是______．
—Could you please tell me _____________?
--“Rome wasn’t built in a day”. You should try to give it enough chances to become strong.
A．why I should do to have a good memory
B．what I can do to have a good memory
C．how can I do to have a good memory
D．what can I do to have a good memory
