锅炉停炉时,应()省煤器旁通烟道,()省煤器烟道接板,但锅炉进水仍需经省煤器。 打开;打开。 打开;关闭。 关闭;打开。 关闭;关闭。
CRH1型动车组电气柜K1上的控制面板开关有哪些?
Which of the following statements is true concerning an oil cooler?() The oil temperature is less than the cooling water temperature。 The oil pressure is less than the cooling water pressure。 The oil pressure is greater than the cooling water pressure。 The oil flow control valve is always installed in the oil input line。
下列选项中不属于收支控制的是() 建立责任单位。 确定责任预算。 现金控制。 组织责任预算。
The Local Notice to Mariners is usually published(). daily。 weekly。 monthly。 semiannually。
当脚手板的面板采用打孔钢板时,在孔洞内可做一内切圆,这个内切圆直径应小于或等于()mm。