估算建安工程费用时，可以将直接费用、间接费用、计划利润和税金直接相加得到。
参考答案：对
David is a musician and he can play the piano very . [ ]
A. good; good
B. well; well
C. good; well
D. well; good
电焊机及电焊变压器的设备容量应统一换算到暂用系数JC=（）%的额定功率，才能确定计算负荷。
A.50
B.65
C.75
D.100
