业主根据监理合同的规定，向监理单位支付的费用包括（）。
A、正常服务的费用
B、附加服务的费用
C、对监理单位的赔偿
D、加班费用
参考答案：A, B, C
--- My son is _____ to be seen. Where has he gone?
--- I think he _____ in the building.
A．nowhere; must be hiding
B．nowhere; must be hidden himself
C．anywhere; hides
D．everywhere; hides himself
常用调节阀有哪几种？
