机修工进入现场后，要与所维修设备及与其相关联的设备司机联系。
参考答案：对
When he grows up, he's going to do _______.[ ]
A. what he wants to do
B. what does he want to do
C. what he want to do
D. what do he want to do
垃圾填埋气中甲烷体积含量一般为（）。
A.45％～60％
B.65％～80％
C.80％～90％
D.超过90％
